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Kamyabi-Gol, Rajab Ali

Author ID: kamyabi-gol.rajab-ali Recent zbMATH articles by "Kamyabi-Gol, Rajab Ali"
Published as: Kamyabi-Gol, R. A.; Kamyabi-Gol, Rajab Ali; Gol, R. A. Kamyabi; Kamyabi Gol, R. A.; Gol, Rajab Ali Kamyabi; Kamyabi Gol, Rajab Ali; Kamyabi-Gol, Radjab Ali; Kamyabi-Gol, Rajabali; Kamyabi Gol, Radjab Ali; Gol, Rajabali Kamyabi; Kamyabi Gol, Rajabali; Gol, R. Kamyabi
Homepage: http://kamyabi.profcms.um.ac.ir/
External Links: MGP · ORCID · ResearchGate
all top 5

Serials

8 Bulletin of the Iranian Mathematical Society
8 Journal of Pseudo-Differential Operators and Applications
6 International Journal of Wavelets, Multiresolution and Information Processing
6 Wavelets and Linear Algebra
3 Iranian Journal of Mathematical Sciences and Informatics
2 Indian Journal of Pure & Applied Mathematics
2 Journal of Mathematical Analysis and Applications
2 Journal of the Korean Mathematical Society
2 Bulletin of the Belgian Mathematical Society - Simon Stevin
2 Scientific Bulletin. Series A. Applied Mathematics and Physics. Politehnica University of Bucharest
2 Taiwanese Journal of Mathematics
2 Mediterranean Journal of Mathematics
2 Annals of Functional Analysis
2 Sahand Communications in Mathematical Analysis
1 Bulletin of the Australian Mathematical Society
1 Journal of Mathematical Physics
1 Mathematical Methods in the Applied Sciences
1 Publicationes Mathematicae Debrecen
1 Tamkang Journal of Mathematics
1 Zeitschrift für Analysis und ihre Anwendungen
1 Acta Applicandae Mathematicae
1 The Journal of Geometric Analysis
1 Proceedings of the Indian Academy of Sciences. Mathematical Sciences
1 Applied and Computational Harmonic Analysis
1 Journal of Applied Analysis
1 Nonlinear Functional Analysis and Applications
1 Scientiae Mathematicae Japonicae
1 Kragujevac Journal of Mathematics
1 Mathematical Reports
1 Journal of Applied Mathematics and Computing
1 Hacettepe Journal of Mathematics and Statistics
1 Thai Journal of Mathematics
1 Complex Variables and Elliptic Equations
1 Complex Analysis and Operator Theory
1 International Journal of Algebra
1 Journal of Mathematical Extension
1 Journal of Mahani Mathematical Research Center
1 Journal of Linear and Topological Algebra
1 Khayyam Journal of Mathematics
1 Korean Journal of Mathematics

Publications by Year

Citations contained in zbMATH Open

43 Publications have been cited 173 times in 122 Documents Cited by Year
The structure of shift invariant spaces on a locally compact abelian group. Zbl 1136.43006
Gol, R. A. Kamyabi; Tousi, R. Raisi
39
2008
Continuous Gabor transform for a class of non-abelian groups. Zbl 1268.43002
Farashahi, Arash Ghaani; Kamyabi-Gol, Rajabali
21
2012
On the square integrability of quasi regular representation on semidirect product groups. Zbl 1168.43002
Arefijamaal, A. A.; Kamyabi-Gol, R. A.
14
2009
A range function approach to shift-invariant spaces on locally compact abelian groups. Zbl 1188.43002
Gol, R. A. Kamyabi; Tousi, R. Raisi
13
2010
On infinite-horizon optimal control problems. Zbl 0964.49003
Effati, S.; Kamyad, A. V.; Kamyabi-Gol, R. A.
7
2000
Abstract shearlet transform. Zbl 1333.42054
Kamyabi-Gol, R. A.; Atayi, V.
6
2015
Wavelet transforms via generalized quasi-regular representations. Zbl 1184.42031
Kamyabi-Gol, R. A.; Tavallaei, N.
5
2009
Some equivalent multiresolution conditions on locally compact Abelian groups. Zbl 1206.43005
Kamyabi-Gol, R. A.; Tousi, R. Raisi
5
2010
On construction of coherent states associated with semidirect procucts. Zbl 1151.81342
Arefijamaal, A. A.; Kamyabi-Gol, R. A.
4
2008
Continuous wavelet transform on a special homogeneous space. Zbl 1062.43019
Fashandi, M.; Kamyabi Gol, R. A.; Niknam, A.; Pourabdollah, M. A.
4
2003
Localization operators on homogeneous spaces. Zbl 1305.43004
Gol, R. Kamyabi; Esmaeelzadeh, F.; Tousi, R. Raisi
4
2013
Distance between continuous frames in Hilbert space. Zbl 1362.42058
Amiri, Zahra; Kamyabi-Gol, Rajab Ali
4
2017
On the continuous wavelet transform on homogeneous spaces. Zbl 1254.43003
Esmaeelzadeh, F.; Gol, R. A. Kamyabi; Tousi, R. Raisi
4
2012
Study of shearlet transform using block matrix dilation. Zbl 1387.42033
Amiri, Z.; Bagherzadeh, H.; Harati, A.; Kamyabi-Gol, R. A.
3
2018
\(N\)-relatively invariant and \(N\)-invariant measure on double coset spaces. Zbl 1509.43002
Fahimian, F.; Kamyabi Gol, R. A.; Esmaeelzadeh, F.
3
2019
Banach algebras related to the elements of the unit ball of a Banach algebra. Zbl 1180.46041
Kamyabi-Gol, R. A.; Janfada, M.
2
2008
On the operators related to C.W.T on general homogeneous spaces. Zbl 1378.43001
Sajadi Rad, O. D.; Esmaeelzadeh, F.; Kamyabi Gol, R. A.
2
2017
Continuous frames and g-frames. Zbl 1336.42020
Avazzadeh, S. H.; Kamyabi-Gol, R. A.; Tousi, R. Raisi
2
2014
A class of compact operators on homogeneous spaces. Zbl 1310.43002
Esmaeelzadeh, Fatemah; Gol, Rajab Ali Kamyabi; Tousi, Reihaneh Raisi
2
2014
Two-wavelet constants for square integrable representations of \(G/H\). Zbl 1369.43001
Gol, R. A. Kamyabi; Esmaeelzadeh, F.; Tousi, R. Raisi
2
2014
On the characterization of subrepresentations of shearlet group. Zbl 1369.42027
Atayi, V.; Kamyabi-Gol, R. A.
2
2015
Weyl transforms and the products of two wavelet multiplier operators on locally compact abelian topological groups. Zbl 1429.43003
Abdullah, M. Kh.; Kamyabi-Gol, R. A.; Janfada, M.
2
2019
The structure of finitely generated shift-invariant subspaces on locally compact abelian groups. Zbl 1466.43003
Tabatabaie, Seyyed Mohammad; Kazarian, Kazaros; Kamyabi Gol, Rajab Ali; Jokar, Soheila
2
2021
On wavelet multipliers and Landau-Pollak-Slepian operators on locally compact abelian topological groups. Zbl 1414.43003
Abdullah, M. Kh.; Kamyabi Gol, R. A.; Janfada, M.
2
2019
Shift invariant spaces and shift preserving operators on locally compact Abelian groups. Zbl 1275.47018
Raisi Tousi, R.; Kamyabi Gol, R. A.
2
2011
On the topological centre of \(L^{1}(G/H)^{\ast\ast}\). Zbl 1247.43002
Raisi Tousi, R.; Kamyabi-Gol, R. A.; Vishki, H. R. Ebrahimi
1
2012
Inpainting via high-dimensional universal shearlet systems. Zbl 1407.42027
Amiri, Z.; Kamyabi-Gol, R. A.
1
2018
On the C.W.T on homogeneous spaces associated to quasi invariant measure. Zbl 1397.43003
Esmaeelzadeh, Fatemeh; Kamyabi Gol, Rajab Ali
1
2018
\(\varphi\)-factorable operators and Weyl-Heisenberg frames on LCA groups. Zbl 1228.43002
Kamyabi Gol, R. A.; Raisi Tousi, R.
1
2011
Shift preserving operators on locally compact abelian groups. Zbl 1245.43002
Gol, R. A. Kamyabi; Tousi, R. Raisi
1
2011
On the mutually commuting \(n\)-tuples in compact groups. Zbl 1146.22008
Erfanian, A.; Kamyabi-Gol, R.
1
2007
Frame for operators in finite dimensional Hilbert space. Zbl 1400.42041
Morshedi, Vahid Reza; Janfada, Mohammad; Gol, Rajabali Kamyabi
1
2018
Homogeneous spaces and square-integrable representations. Zbl 1342.43008
Esmaeelzadeh, Fatemeh; Gol, Rajab Ali Kamyabi
1
2016
On the generalized quotient integrals on homogeneous spaces. Zbl 1378.43007
Derikvand, Tajedin; Kamyabi-Gol, Rajab Ali; Janfada, Mohammad
1
2017
Abstract structure of partial function \(\ast\)-algebras over semi-direct product of locally compact groups. Zbl 1377.43002
Farashahi, Arash Ghaani; Kamyabi Gol, Rajab Ali
1
2015
Pseudoframe multiresolution structure on abelian locally compact groups. Zbl 1375.42047
Azarmi, Hamide; Kamyabi Gol, Radjab Ali; Janfada, Mohammad
1
2016
Equichordal tight fusion frames. Zbl 1456.42043
Mohammadpour, Mozhgan; Kamyabi-Gol, Rajab Ali; Hodtani, Ghosheh Abed
1
2020
Determination of subrepresentations of the standard higher dimensional shearlet group. Zbl 1412.22016
Zare, Masoumeh; Kamyabi-Gol, Rajab Ali; Amiri, Zahra
1
2017
On the two-wavelet localization operators on homogeneous spaces with relatively invariant measures. Zbl 1412.43005
Esmaeelzadeh, Fatemeh; Kamyabi-Gol, Rajab Ali; Raisi Tousi, Reihaneh
1
2017
Approximately dual frames in Banach spaces via semi-inner products. Zbl 1513.42131
Morshedi, Vahid Reza; Janfada, Mohammad; Kamyabi Gol, Rajabali
1
2020
On the frames of translates on locally compact abelian groups. Zbl 1507.43003
Seyedi, Najmeh Sadat; Gol, Rajab Ali Kamyabi
1
2022
Quaternionic inverse Fourier transforms on locally compact abelian groups. Zbl 1485.43003
Saadan, Majid Jabbar; Janfada, Mohammad; Kamyabi-Gol, Radjab Ali
1
2021
On a metric on translation invariant spaces. Zbl 1482.43001
Mortazavizadeh, M.; Raisi Tousi, R.; Kamyabi Gol, R. A.
1
2019
On the frames of translates on locally compact abelian groups. Zbl 1507.43003
Seyedi, Najmeh Sadat; Gol, Rajab Ali Kamyabi
1
2022
The structure of finitely generated shift-invariant subspaces on locally compact abelian groups. Zbl 1466.43003
Tabatabaie, Seyyed Mohammad; Kazarian, Kazaros; Kamyabi Gol, Rajab Ali; Jokar, Soheila
2
2021
Quaternionic inverse Fourier transforms on locally compact abelian groups. Zbl 1485.43003
Saadan, Majid Jabbar; Janfada, Mohammad; Kamyabi-Gol, Radjab Ali
1
2021
Equichordal tight fusion frames. Zbl 1456.42043
Mohammadpour, Mozhgan; Kamyabi-Gol, Rajab Ali; Hodtani, Ghosheh Abed
1
2020
Approximately dual frames in Banach spaces via semi-inner products. Zbl 1513.42131
Morshedi, Vahid Reza; Janfada, Mohammad; Kamyabi Gol, Rajabali
1
2020
\(N\)-relatively invariant and \(N\)-invariant measure on double coset spaces. Zbl 1509.43002
Fahimian, F.; Kamyabi Gol, R. A.; Esmaeelzadeh, F.
3
2019
Weyl transforms and the products of two wavelet multiplier operators on locally compact abelian topological groups. Zbl 1429.43003
Abdullah, M. Kh.; Kamyabi-Gol, R. A.; Janfada, M.
2
2019
On wavelet multipliers and Landau-Pollak-Slepian operators on locally compact abelian topological groups. Zbl 1414.43003
Abdullah, M. Kh.; Kamyabi Gol, R. A.; Janfada, M.
2
2019
On a metric on translation invariant spaces. Zbl 1482.43001
Mortazavizadeh, M.; Raisi Tousi, R.; Kamyabi Gol, R. A.
1
2019
Study of shearlet transform using block matrix dilation. Zbl 1387.42033
Amiri, Z.; Bagherzadeh, H.; Harati, A.; Kamyabi-Gol, R. A.
3
2018
Inpainting via high-dimensional universal shearlet systems. Zbl 1407.42027
Amiri, Z.; Kamyabi-Gol, R. A.
1
2018
On the C.W.T on homogeneous spaces associated to quasi invariant measure. Zbl 1397.43003
Esmaeelzadeh, Fatemeh; Kamyabi Gol, Rajab Ali
1
2018
Frame for operators in finite dimensional Hilbert space. Zbl 1400.42041
Morshedi, Vahid Reza; Janfada, Mohammad; Gol, Rajabali Kamyabi
1
2018
Distance between continuous frames in Hilbert space. Zbl 1362.42058
Amiri, Zahra; Kamyabi-Gol, Rajab Ali
4
2017
On the operators related to C.W.T on general homogeneous spaces. Zbl 1378.43001
Sajadi Rad, O. D.; Esmaeelzadeh, F.; Kamyabi Gol, R. A.
2
2017
On the generalized quotient integrals on homogeneous spaces. Zbl 1378.43007
Derikvand, Tajedin; Kamyabi-Gol, Rajab Ali; Janfada, Mohammad
1
2017
Determination of subrepresentations of the standard higher dimensional shearlet group. Zbl 1412.22016
Zare, Masoumeh; Kamyabi-Gol, Rajab Ali; Amiri, Zahra
1
2017
On the two-wavelet localization operators on homogeneous spaces with relatively invariant measures. Zbl 1412.43005
Esmaeelzadeh, Fatemeh; Kamyabi-Gol, Rajab Ali; Raisi Tousi, Reihaneh
1
2017
Homogeneous spaces and square-integrable representations. Zbl 1342.43008
Esmaeelzadeh, Fatemeh; Gol, Rajab Ali Kamyabi
1
2016
Pseudoframe multiresolution structure on abelian locally compact groups. Zbl 1375.42047
Azarmi, Hamide; Kamyabi Gol, Radjab Ali; Janfada, Mohammad
1
2016
Abstract shearlet transform. Zbl 1333.42054
Kamyabi-Gol, R. A.; Atayi, V.
6
2015
On the characterization of subrepresentations of shearlet group. Zbl 1369.42027
Atayi, V.; Kamyabi-Gol, R. A.
2
2015
Abstract structure of partial function \(\ast\)-algebras over semi-direct product of locally compact groups. Zbl 1377.43002
Farashahi, Arash Ghaani; Kamyabi Gol, Rajab Ali
1
2015
Continuous frames and g-frames. Zbl 1336.42020
Avazzadeh, S. H.; Kamyabi-Gol, R. A.; Tousi, R. Raisi
2
2014
A class of compact operators on homogeneous spaces. Zbl 1310.43002
Esmaeelzadeh, Fatemah; Gol, Rajab Ali Kamyabi; Tousi, Reihaneh Raisi
2
2014
Two-wavelet constants for square integrable representations of \(G/H\). Zbl 1369.43001
Gol, R. A. Kamyabi; Esmaeelzadeh, F.; Tousi, R. Raisi
2
2014
Localization operators on homogeneous spaces. Zbl 1305.43004
Gol, R. Kamyabi; Esmaeelzadeh, F.; Tousi, R. Raisi
4
2013
Continuous Gabor transform for a class of non-abelian groups. Zbl 1268.43002
Farashahi, Arash Ghaani; Kamyabi-Gol, Rajabali
21
2012
On the continuous wavelet transform on homogeneous spaces. Zbl 1254.43003
Esmaeelzadeh, F.; Gol, R. A. Kamyabi; Tousi, R. Raisi
4
2012
On the topological centre of \(L^{1}(G/H)^{\ast\ast}\). Zbl 1247.43002
Raisi Tousi, R.; Kamyabi-Gol, R. A.; Vishki, H. R. Ebrahimi
1
2012
Shift invariant spaces and shift preserving operators on locally compact Abelian groups. Zbl 1275.47018
Raisi Tousi, R.; Kamyabi Gol, R. A.
2
2011
\(\varphi\)-factorable operators and Weyl-Heisenberg frames on LCA groups. Zbl 1228.43002
Kamyabi Gol, R. A.; Raisi Tousi, R.
1
2011
Shift preserving operators on locally compact abelian groups. Zbl 1245.43002
Gol, R. A. Kamyabi; Tousi, R. Raisi
1
2011
A range function approach to shift-invariant spaces on locally compact abelian groups. Zbl 1188.43002
Gol, R. A. Kamyabi; Tousi, R. Raisi
13
2010
Some equivalent multiresolution conditions on locally compact Abelian groups. Zbl 1206.43005
Kamyabi-Gol, R. A.; Tousi, R. Raisi
5
2010
On the square integrability of quasi regular representation on semidirect product groups. Zbl 1168.43002
Arefijamaal, A. A.; Kamyabi-Gol, R. A.
14
2009
Wavelet transforms via generalized quasi-regular representations. Zbl 1184.42031
Kamyabi-Gol, R. A.; Tavallaei, N.
5
2009
The structure of shift invariant spaces on a locally compact abelian group. Zbl 1136.43006
Gol, R. A. Kamyabi; Tousi, R. Raisi
39
2008
On construction of coherent states associated with semidirect procucts. Zbl 1151.81342
Arefijamaal, A. A.; Kamyabi-Gol, R. A.
4
2008
Banach algebras related to the elements of the unit ball of a Banach algebra. Zbl 1180.46041
Kamyabi-Gol, R. A.; Janfada, M.
2
2008
On the mutually commuting \(n\)-tuples in compact groups. Zbl 1146.22008
Erfanian, A.; Kamyabi-Gol, R.
1
2007
Continuous wavelet transform on a special homogeneous space. Zbl 1062.43019
Fashandi, M.; Kamyabi Gol, R. A.; Niknam, A.; Pourabdollah, M. A.
4
2003
On infinite-horizon optimal control problems. Zbl 0964.49003
Effati, S.; Kamyad, A. V.; Kamyabi-Gol, R. A.
7
2000
all top 5

Cited by 132 Authors

26 Kamyabi-Gol, Rajab Ali
12 Farashahi, Arash Ghaani
11 Esmaeelzadeh, Fatemeh
11 Raisi Tousi, Reihaneh
5 Arefijamaal, Ali Akbar
5 Paternostro, Victoria
5 Shah, Firdous Ahmad
4 Adhikari, Saswata
4 Kumar, Ajay
4 Mortazavizadeh, Mahdi
4 Radha, Ramakrishnan
3 Arati, Shashi
3 Effati, Sohrab
3 Fahlaoui, Said
3 Faress, Moussa
3 Iverson, Joseph W.
3 Janfada, Mohammad
3 Kumar, Raj
3 Radha, Ram
3 Rahimi, Asghar
3 Ramakrishnan, Radha
3 Satyapriya
3 Sharma, Jyoti
2 Abdullah, M. Kh.
2 Abid, Khouloud
2 Alijani, Azadeh
2 Amiri, Zahra
2 Bansal, Ashish
2 Barbieri, Davide Francesco
2 Bownik, Marcin
2 Cabrelli, Carlos A.
2 Das, Santi Ranjan
2 Dehghan, Mohammad Ali
2 Fahimian, Fatemeh
2 Firouzi Parizi, Maryam
2 Hernandez, Eugenio
2 Jokar, Soheila
2 Lone, Waseem Z.
2 Nazemi, Ali Reza
2 Nazemi, Alireza
2 Saadan, Majid Jabbar
2 Sajadi Rad, Olya Dokht
2 Seddighi, Niloufar
2 Shukla, Niraj K.
2 Smaoui, Kais
2 Tabatabaie, Seyyed Mohammad
2 Tavallaei, Narguess
2 Velsamy, Rabeetha
2 Zare, Masoumeh
1 Abtahi, Fatemeh
1 Afrapoli, Fatemeh Roohi
1 Ahmadi, Ahmad
1 Anastasio, Magali
1 Askari-Hemmat, Ataollah
1 Avazzadeh, Hosein
1 Bagherzadeh, H.
1 Bahri, Mawardi
1 Bansal, Piyush
1 Barootkoob, Sedigheh
1 Basirzadeh, Hadi
1 Benedetto, John Joseph
1 Benedetto, Robert L.
1 Bu, Rui
1 Chirikjian, Gregory S.
1 Deepshikha
1 Dehghan, Hossein
1 Deng, Caixia
1 Do, Van Tiep
1 Ettefagh, Mina
1 Fard, Mohammad Ali Hasankhani
1 Fashandi, Massoumeh
1 Feichtinger, Hans Georg
1 García, Antonio G.
1 Garg, Tarun K.
1 Gillan, Behrooz Olfatian
1 Gu, Lijuan
1 Gumber, Anupam
1 Guo, Xiaoli
1 Han, Deguang
1 Harati, Ahad
1 Hovemann, Marc
1 Hu, Qianfeng
1 Huang, Qiang
1 Ishi, Hideyuki
1 Javadi, Zeinab
1 Kamali, Zeinab
1 Kamyad, Ali Vahidian
1 Karizaki, Mehdi Mohammadzadeh
1 Kazarian, Kazaros S.
1 Keyshams, Zahra
1 Khoddami, Ali Reza
1 Khosravi, AminAllah
1 King, Emily Jeannette
1 Kopsch, Anne
1 Kumar, Nageswaran Shravan
1 Kutyniok, Gitta
1 Levie, Ron
1 Lian, Qiaofang
1 Liu, Rui
1 Liu, Xiaochun
...and 32 more Authors
all top 5

Cited in 62 Serials

10 Journal of Pseudo-Differential Operators and Applications
9 International Journal of Wavelets, Multiresolution and Information Processing
6 Mediterranean Journal of Mathematics
5 Journal of Mathematical Analysis and Applications
4 Journal of Functional Analysis
4 Bulletin of the Iranian Mathematical Society
4 Journal of Applied Mathematics and Computing
3 Linear and Multilinear Algebra
3 Banach Journal of Mathematical Analysis
3 Sahand Communications in Mathematical Analysis
3 Wavelets and Linear Algebra
3 Advances in Operator Theory
2 Collectanea Mathematica
2 Results in Mathematics
2 The Journal of Geometric Analysis
2 Linear Algebra and its Applications
2 Proceedings of the Indian Academy of Sciences. Mathematical Sciences
2 Bulletin des Sciences Mathématiques
2 The Journal of Fourier Analysis and Applications
2 Journal of the Australian Mathematical Society
2 Bulletin of the Malaysian Mathematical Sciences Society. Second Series
2 Analysis and Applications (Singapore)
2 Advances in Pure and Applied Mathematics
2 Analysis and Mathematical Physics
2 Journal of Linear and Topological Algebra
2 Khayyam Journal of Mathematics
1 Analysis Mathematica
1 International Journal of Control
1 Indian Journal of Pure & Applied Mathematics
1 Mathematical Methods in the Applied Sciences
1 Studia Mathematica
1 Applied Mathematics and Computation
1 Journal of Computational and Applied Mathematics
1 Nagoya Mathematical Journal
1 Numerical Functional Analysis and Optimization
1 Transactions of the American Mathematical Society
1 Circuits, Systems, and Signal Processing
1 Journal of Contemporary Mathematical Analysis. Armenian Academy of Sciences
1 Journal de Mathématiques Pures et Appliquées. Neuvième Série
1 Indagationes Mathematicae. New Series
1 Applied and Computational Harmonic Analysis
1 Computational and Applied Mathematics
1 Georgian Mathematical Journal
1 Integral Transforms and Special Functions
1 Journal of Inequalities and Applications
1 Fractional Calculus & Applied Analysis
1 The ANZIAM Journal
1 Hacettepe Journal of Mathematics and Statistics
1 The Australian Journal of Mathematical Analysis and Applications
1 Complex Variables and Elliptic Equations
1 Journal of Physics A: Mathematical and Theoretical
1 European Journal of Pure and Applied Mathematics
1 Tbilisi Mathematical Journal
1 Revista de la Real Academia de Ciencias Exactas, Físicas y Naturales. Serie A: Matemáticas. RACSAM
1 Afrika Matematika
1 Journal of Mathematical Extension
1 Iranian Journal of Mathematical Sciences and Informatics
1 Journal of Mahani Mathematical Research Center
1 Journal of Mathematics
1 Mathematics
1 Bollettino dell’Unione Matematica Italiana
1 Constructive Mathematical Analysis

Citations by Year