Causey, R. M.; Galego, E. M.; Samuel, C. Solution to a problem of Diestel. (English) Zbl 07268392 Proc. Am. Math. Soc. 148, No. 12, 5261-5267 (2020). MSC: 46M05 46B28 PDF BibTeX XML Cite \textit{R. M. Causey} et al., Proc. Am. Math. Soc. 148, No. 12, 5261--5267 (2020; Zbl 07268392) Full Text: DOI
Rao, T. S. S. R. K. Geometry of spaces of compact operators. (English) Zbl 07153058 Acta Sci. Math. 85, No. 3-4, 495-505 (2019). Reviewer: Ömer Gök (Istanbul) MSC: 46B28 46B25 PDF BibTeX XML Cite \textit{T. S. S. R. K. Rao}, Acta Sci. Math. 85, No. 3--4, 495--505 (2019; Zbl 07153058) Full Text: DOI
Klimov, I. V. Simple spectrum of tensor products and typical properties of measure-preserving flows. (English. Russian original) Zbl 1408.37006 Math. Notes 104, No. 6, 927-929 (2018); translation from Mat. Zametki 104, No. 6, 942-944 (2018). MSC: 37A10 37C10 37C05 PDF BibTeX XML Cite \textit{I. V. Klimov}, Math. Notes 104, No. 6, 927--929 (2018; Zbl 1408.37006); translation from Mat. Zametki 104, No. 6, 942--944 (2018) Full Text: DOI
Björn, Anders; Björn, Jana Tensor products and sums of \(p\)-harmonic functions, quasiminimizers and \(p\)-admissible weights. (English) Zbl 1407.31005 Proc. Am. Math. Soc. 146, No. 12, 5195-5203 (2018). Reviewer: Olli Martio (Helsinki) MSC: 31C45 35J60 46E35 PDF BibTeX XML Cite \textit{A. Björn} and \textit{J. Björn}, Proc. Am. Math. Soc. 146, No. 12, 5195--5203 (2018; Zbl 1407.31005) Full Text: DOI
García-Lirola, Luis; Raja, Matías On strong asymptotic uniform smoothness and convexity. (English) Zbl 1403.46016 Rev. Mat. Complut. 31, No. 1, 131-152 (2018). Reviewer: Anna Pelczar-Barwacz (Kraków) MSC: 46B20 46B06 46B28 PDF BibTeX XML Cite \textit{L. García-Lirola} and \textit{M. Raja}, Rev. Mat. Complut. 31, No. 1, 131--152 (2018; Zbl 1403.46016) Full Text: DOI
Wood, Simon N. P-splines with derivative based penalties and tensor product smoothing of unevenly distributed data. (English) Zbl 1384.65020 Stat. Comput. 27, No. 4, 985-989 (2017). MSC: 65D07 62G08 PDF BibTeX XML Cite \textit{S. N. Wood}, Stat. Comput. 27, No. 4, 985--989 (2017; Zbl 1384.65020) Full Text: DOI
Kolesnikov, A. V.; Milman, E. Riemannian metrics on \(\mathbb{R}^n\) and Sobolev-type inequalities. (English. Russian original) Zbl 1360.53037 Dokl. Math. 94, No. 2, 510-513 (2016); translation from Dokl. Akad. Nauk, Ross. Akad. Nauk 470, No. 2, 1137-140 (2016). Reviewer: Ryszard Pawlak (Łódź) MSC: 53C20 46E35 PDF BibTeX XML Cite \textit{A. V. Kolesnikov} and \textit{E. Milman}, Dokl. Math. 94, No. 2, 510--513 (2016; Zbl 1360.53037); translation from Dokl. Akad. Nauk, Ross. Akad. Nauk 470, No. 2, 1137--140 (2016) Full Text: DOI
Romani, Lucia A Chaikin-based variant of Lane-Riesenfeld algorithm and its non-tensor product extension. (English) Zbl 1417.65108 Comput. Aided Geom. Des. 32, 22-49 (2015). MSC: 65D18 PDF BibTeX XML Cite \textit{L. Romani}, Comput. Aided Geom. Des. 32, 22--49 (2015; Zbl 1417.65108) Full Text: DOI
Höynälänmaa, Tommi Multiresolution analysis for compactly supported interpolating tensor product wavelets. (English) Zbl 1341.46009 Int. J. Wavelets Multiresolut. Inf. Process. 13, No. 2, Article ID 1550010, 36 p. (2015). MSC: 46B15 42C40 46E35 PDF BibTeX XML Cite \textit{T. Höynälänmaa}, Int. J. Wavelets Multiresolut. Inf. Process. 13, No. 2, Article ID 1550010, 36 p. (2015; Zbl 1341.46009) Full Text: DOI
Bible, Victor Using boundaries to find smooth norms. (English) Zbl 1320.46009 Stud. Math. 224, No. 2, 169-181 (2014). Reviewer: Olav Nygaard (Kristiansand) MSC: 46B03 46B20 46G05 PDF BibTeX XML Cite \textit{V. Bible}, Stud. Math. 224, No. 2, 169--181 (2014; Zbl 1320.46009) Full Text: DOI arXiv
Karol’, Andrei I.; Nazarov, Alexander I. Small ball probabilities for smooth Gaussian fields and tensor products of compact operators. (English) Zbl 1301.60044 Math. Nachr. 287, No. 5-6, 595-609 (2014). Reviewer: Nikolai N. Leonenko (Cardiff) MSC: 60G15 60G60 47A80 60G12 60F10 62M40 PDF BibTeX XML Cite \textit{A. I. Karol'} and \textit{A. I. Nazarov}, Math. Nachr. 287, No. 5--6, 595--609 (2014; Zbl 1301.60044) Full Text: DOI arXiv
Wood, Simon N.; Scheipl, Fabian; Faraway, Julian J. Straightforward intermediate rank tensor product smoothing in mixed models. (English) Zbl 1322.62197 Stat. Comput. 23, No. 3, 341-360 (2013). MSC: 62J12 62J10 62G05 65C60 PDF BibTeX XML Cite \textit{S. N. Wood} et al., Stat. Comput. 23, No. 3, 341--360 (2013; Zbl 1322.62197) Full Text: DOI
Chegini, Nabi; Dahlke, Stephan; Friedrich, Ulrich; Stevenson, Rob Piecewise tensor product wavelet bases by extensions and approximation rates. (English) Zbl 1277.65093 Math. Comput. 82, No. 284, 2157-2190 (2013). Reviewer: Manfred Tasche (Rostock) MSC: 65N30 65T60 65N12 46E35 35B65 41A25 35J05 65N55 PDF BibTeX XML Cite \textit{N. Chegini} et al., Math. Comput. 82, No. 284, 2157--2190 (2013; Zbl 1277.65093) Full Text: DOI
Kirichenko, V. F.; Kharitonova, S. V. On the geometry of normal locally conformal almost cosymplectic manifolds. (English. Russian original) Zbl 1283.53029 Math. Notes 91, No. 1, 34-45 (2012); translation from Mat. Zametki 91, No. 1, 40-53 (2012). MSC: 53C10 53C15 PDF BibTeX XML Cite \textit{V. F. Kirichenko} and \textit{S. V. Kharitonova}, Math. Notes 91, No. 1, 34--45 (2012; Zbl 1283.53029); translation from Mat. Zametki 91, No. 1, 40--53 (2012) Full Text: DOI
Dmytryshyn, Mar’yan Interpolation of tensor products of exponential type vectors of closed operators. (Ukrainian. English summary) Zbl 1265.41072 Mat. Visn. Nauk. Tov. Im. Shevchenka 9, 89-96 (2012). MSC: 41A65 47A57 46E35 PDF BibTeX XML Cite \textit{M. Dmytryshyn}, Mat. Visn. Nauk. Tov. Im. Shevchenka 9, 89--96 (2012; Zbl 1265.41072)
Hansen, Markus; Sickel, Winfried Best \(m\)-term approximation and Sobolev-Besov spaces of dominating mixed smoothness – the case of compact embeddings. (English) Zbl 1251.41005 Constr. Approx. 36, No. 1, 1-51 (2012). Reviewer: Martin D. Buhmann (Gießen) MSC: 41A25 41A46 41A63 42C40 46E35 46B70 PDF BibTeX XML Cite \textit{M. Hansen} and \textit{W. Sickel}, Constr. Approx. 36, No. 1, 1--51 (2012; Zbl 1251.41005) Full Text: DOI
Dmytryshyn, Maryan Exponential type vectors of closed operators on tensor products. (Ukrainian. English summary) Zbl 1265.41071 Mat. Visn. Nauk. Tov. Im. Shevchenka 8, 60-68 (2011). MSC: 41A65 47A57 47A58 46E35 PDF BibTeX XML Cite \textit{M. Dmytryshyn}, Mat. Visn. Nauk. Tov. Im. Shevchenka 8, 60--68 (2011; Zbl 1265.41071)
Sickel, Winfried; Ullrich, Tino Spline interpolation on sparse grids. (English) Zbl 1219.41012 Appl. Anal. 90, No. 3-4, 337-383 (2011). Reviewer: Martin D. Buhmann (Gießen) MSC: 41A25 41A63 42B99 46E35 65D05 65D07 PDF BibTeX XML Cite \textit{W. Sickel} and \textit{T. Ullrich}, Appl. Anal. 90, No. 3--4, 337--383 (2011; Zbl 1219.41012) Full Text: DOI
Brussel, E.; McKinnie, K.; Tengan, E. Indecomposable and noncrossed product division algebras over function fields of smooth \(p\)-adic curves. (English) Zbl 1253.16019 Adv. Math. 226, No. 5, 4316-4337 (2011). Reviewer: Uzi Vishne (Ramat-Gan) MSC: 16K20 12E15 14H05 16K50 PDF BibTeX XML Cite \textit{E. Brussel} et al., Adv. Math. 226, No. 5, 4316--4337 (2011; Zbl 1253.16019) Full Text: DOI
Radzki, Wiktor Contractions of product density operators of systems of identical fermions and bosons. (English) Zbl 1222.81119 Int. J. Math. Math. Sci. 2010, Article ID 890523, 26 p. (2010). Reviewer: Miyeon Kwon (Platteville) MSC: 81P16 47N50 46E35 46M05 47A80 PDF BibTeX XML Cite \textit{W. Radzki}, Int. J. Math. Math. Sci. 2010, Article ID 890523, 26 p. (2010; Zbl 1222.81119) Full Text: DOI EuDML
Augustin, Nicole H.; Musio, Monica; von Wilpert, Klaus; Kublin, Edgar; Wood, Simon N.; Schumacher, Martin Modeling spatiotemporal forest health monitoring data. (English) Zbl 1388.62093 J. Am. Stat. Assoc. 104, No. 487, 899-911 (2009). MSC: 62G07 62H11 62M30 62P12 62C12 PDF BibTeX XML Cite \textit{N. H. Augustin} et al., J. Am. Stat. Assoc. 104, No. 487, 899--911 (2009; Zbl 1388.62093) Full Text: DOI
Ouakkasse, N. Tensor product decomposition of Sobolev spaces and class of \(p\)-nuclear operators. (English) Zbl 1218.46019 Algebras Groups Geom. 25, No. 1, 39-52 (2008). MSC: 46E35 46B28 PDF BibTeX XML Cite \textit{N. Ouakkasse}, Algebras Groups Geom. 25, No. 1, 39--52 (2008; Zbl 1218.46019)
Khurana, Surjit Singh Product of vector measures on topological spaces. (English) Zbl 1212.46064 Commentat. Math. Univ. Carol. 49, No. 3, 421-435 (2008). Reviewer: Bohumír Opic (Praha) MSC: 46G10 28C15 28C10 28C05 PDF BibTeX XML Cite \textit{S. S. Khurana}, Commentat. Math. Univ. Carol. 49, No. 3, 421--435 (2008; Zbl 1212.46064) Full Text: EMIS EuDML
Peller, V. V. On S. Mazur’s problems 8 and 88 from the Scottish Book. (English) Zbl 1127.47027 Stud. Math. 180, No. 2, 191-198 (2007). Reviewer: Daniel Suárez (Barcelona) MSC: 47B35 46M05 47A07 46E35 PDF BibTeX XML Cite \textit{V. V. Peller}, Stud. Math. 180, No. 2, 191--198 (2007; Zbl 1127.47027) Full Text: DOI arXiv
Olshevsky, Vadim; Oseledets, Ivan; Tyrtyshnikov, Eugene Tensor properties of multilevel Toeplitz and related matrices. (English) Zbl 1082.15044 Linear Algebra Appl. 412, No. 1, 1-21 (2006). Reviewer: Yueh-er Kuo (Knoxville) MSC: 15A69 15A12 15B57 65F30 15A09 PDF BibTeX XML Cite \textit{V. Olshevsky} et al., Linear Algebra Appl. 412, No. 1, 1--21 (2006; Zbl 1082.15044) Full Text: DOI
Sharples, J. J.; Hutchinson, M. F. Multivariate spatial smoothing using additive regression splines. (English) Zbl 1063.65519 ANZIAM J. 45C, Proc. 2003, C676-C692 (2004). MSC: 65C60 62J05 65D10 65D07 PDF BibTeX XML Cite \textit{J. J. Sharples} and \textit{M. F. Hutchinson}, ANZIAM J. 45C, C676--C692 (2004; Zbl 1063.65519) Full Text: Link
Mendes, Diana Aldea; Sousa Ramos, José Kneading theory for triangular maps. (English) Zbl 1052.37008 Int. J. Pure Appl. Math. 10, No. 4, 421-450 (2004). Reviewer: Jerzy Ombach (Kraków) MSC: 37B10 37B40 37E05 15A69 PDF BibTeX XML Cite \textit{D. A. Mendes} and \textit{J. Sousa Ramos}, Int. J. Pure Appl. Math. 10, No. 4, 421--450 (2004; Zbl 1052.37008)
Guo, Wensheng; Dai, Ming; Ombao, Hernando C.; von Sachs, Rainer Smoothing spline ANOVA for time-dependent spectral analysis. (English) Zbl 1040.62082 J. Am. Stat. Assoc. 98, No. 463, 643-652 (2003). MSC: 62M15 62J10 62M10 65C60 62F10 62F03 PDF BibTeX XML Cite \textit{W. Guo} et al., J. Am. Stat. Assoc. 98, No. 463, 643--652 (2003; Zbl 1040.62082) Full Text: DOI
Vershik, A. M. Classification of measurable functions of several variables and invariantly distributed random matrices. (English. Russian original) Zbl 1025.28010 Funct. Anal. Appl. 36, No. 2, 93-105 (2002); translation from Funkts. Anal. Prilozh. 36, No. 2, 12-27 (2002). MSC: 28D05 60E05 28A35 15B52 37C40 PDF BibTeX XML Cite \textit{A. M. Vershik}, Funct. Anal. Appl. 36, No. 2, 93--105 (2002; Zbl 1025.28010); translation from Funkts. Anal. Prilozh. 36, No. 2, 12--27 (2002) Full Text: DOI
Chen, Di-Rong; Plonka, Gerlind Convergence of cascade algorithms in Sobolev spaces for perturbed refinement masks. (English) Zbl 1017.42029 J. Approximation Theory 119, No. 2, 133-155 (2002). Reviewer: Bin Han (Edmonton) MSC: 42C40 41A15 46E35 PDF BibTeX XML Cite \textit{D.-R. Chen} and \textit{G. Plonka}, J. Approx. Theory 119, No. 2, 133--155 (2002; Zbl 1017.42029) Full Text: DOI
Biliotti, Leonardo; Mercuri, Francesco; Tausk, Daniel V. A note on tensor fields in Hilbert spaces. (English) Zbl 1016.46023 An. Acad. Bras. Ciênc. 74, No. 2, 207-210 (2002). MSC: 46C05 PDF BibTeX XML Cite \textit{L. Biliotti} et al., An. Acad. Bras. Ciênc. 74, No. 2, 207--210 (2002; Zbl 1016.46023) Full Text: DOI
Skrzypek, Lesław Uniqueness of minimal projections in smooth matrix spaces. (English) Zbl 0969.41021 J. Approximation Theory 107, No. 2, 315-336 (2000). Reviewer: Ioan Şerb (Cluj-Napoca) MSC: 41A65 PDF BibTeX XML Cite \textit{L. Skrzypek}, J. Approx. Theory 107, No. 2, 315--336 (2000; Zbl 0969.41021) Full Text: DOI
Xenophontos, Christos A. The \(hp\) finite element method for singularly perturbed problems in smooth domains. (English) Zbl 0939.65121 Math. Models Methods Appl. Sci. 8, No. 2, 299-326 (1998). MSC: 65N30 35B25 35J25 65N12 PDF BibTeX XML Cite \textit{C. A. Xenophontos}, Math. Models Methods Appl. Sci. 8, No. 2, 299--326 (1998; Zbl 0939.65121) Full Text: DOI
Dietz, Ulrich Geometry reconstruction from measurement point clouds using smooth B-spline surfaces. (Geometrie-Rekonstruktionen aus Meßpunktwolken mit glatten B-Spline-Flächen .) (German) Zbl 0908.65009 Berichte aus der Mathematik. Aachen: Shaker Verlag. 129 p. (1998). MSC: 65D17 65D07 65D10 PDF BibTeX XML Cite \textit{U. Dietz}, Geometrie-Rekonstruktionen aus Meßpunktwolken mit glatten B-Spline-Flächen . Aachen: Shaker Verlag (1998; Zbl 0908.65009)
Kraft, Rainer Adaptive and linearly independent multilevel B-splines. (English) Zbl 0937.65014 Le Méhauté, Alain (ed.) et al., Surface fitting and multiresolution methods. Vol. 2 of the proceedings of the 3rd international conference on Curves and surfaces, held in Chamonix-Mont-Blanc, France, June 27-July 3, 1996. Nashville, TN: Vanderbilt University Press. 209-218 (1997). MSC: 65D07 65D05 PDF BibTeX XML Cite \textit{R. Kraft}, in: Surface fitting and multiresolution methods. Vol. 2 of the proceedings of the 3rd international conference on Curves and surfaces, held in Chamonix-Mont-Blanc, France, June 27--July 3, 1996. Nashville, TN: Vanderbilt University Press. 209--218 (1997; Zbl 0937.65014)
Pospelov, V. V. On the theory of singular expansion in a tensor product of Hilbert spaces. (English. Russian original) Zbl 0854.46019 Russ. Acad. Sci., Sb., Math. 82, No. 2, 357-364 (1995); translation from Mat. Sb. 185, No. 7, 109-118 (1994). MSC: 46C05 46B28 46E35 PDF BibTeX XML Cite \textit{V. V. Pospelov}, Russ. Acad. Sci., Sb., Math. 82, No. 2, 109--118 (1994; Zbl 0854.46019); translation from Mat. Sb. 185, No. 7, 109--118 (1994) Full Text: DOI
Piah, A. R. M. Data reduction on simple closed smooth surfaces. (English) Zbl 0806.65009 Fisher, R. B. (ed.), Design and application of curves and surfaces. Mathematics of surfaces V. Based on the proceedings of the fifth conference on the mathematics of surfaces organized by the Institute of Mathematics and its Applications held in Edinburgh, UK, September 14-16, 1992. Oxford: Clarendon Press. Inst. Math. Appl. Conf. Ser., New Ser. 50, 223-244 (1994). MSC: 65D17 PDF BibTeX XML Cite \textit{A. R. M. Piah}, in: Design and application of curves and surfaces. Mathematics of surfaces V. Based on the proceedings of the fifth conference on the mathematics of surfaces organized by the Institute of Mathematics and its Applications held in Edinburgh, UK, September 14-16, 1992. Oxford: Clarendon Press. 223--244 (1994; Zbl 0806.65009)
Sickel, Winfried Spline representations of functions in Besov-Triebel-Lizorkin spaces on \({\mathbb{R}}^ n\). (English) Zbl 0731.41014 Forum Math. 2, No. 5, 451-475 (1990). Reviewer: C.G.Lascarides (Athens) MSC: 41A15 41A27 41A63 46E35 PDF BibTeX XML Cite \textit{W. Sickel}, Forum Math. 2, No. 5, 451--475 (1990; Zbl 0731.41014) Full Text: DOI EuDML
Dierckx, Paul; Suetens, Paul; Vandermeulen, Dirk An algorithm for surface reconstruction from planar contours using smoothing splines. (English) Zbl 0651.65006 J. Comput. Appl. Math. 23, No. 3, 367-388 (1988). Reviewer: Dayong Cui MSC: 65D15 53A05 65D07 41A15 41A63 PDF BibTeX XML Cite \textit{P. Dierckx} et al., J. Comput. Appl. Math. 23, No. 3, 367--388 (1988; Zbl 0651.65006) Full Text: DOI
Aubin, Jean-Pierre Analyse fonctionnelle appliquée. Tomes 1, 2. Exercises rédigés par Bernard Cornet et Jean-Michel Lasry. (Traduction d’anglais). Mathématiques. (French) Zbl 0654.46001 Paris: Presses Universitaires de France. Tome 1: 241 p.; Tome 2: XIII, pp. 243-465 (1987). Reviewer: J.Lorenz MSC: 46-01 47-01 46E35 46C05 35-01 47A10 35J25 PDF BibTeX XML
Coughran, William M. jun.; Grosse, Eric; Rose, Donald J. Variation diminishing splines in simulation. (English) Zbl 0625.65004 SIAM J. Sci. Stat. Comput. 7, 696-705 (1986). Reviewer: R.Smarzewski MSC: 65D07 41A15 41A63 PDF BibTeX XML Cite \textit{W. M. Coughran jun.} et al., SIAM J. Sci. Stat. Comput. 7, 696--705 (1986; Zbl 0625.65004) Full Text: DOI
Dierckx, P. An algorithm for fitting data over a circle using tensor product splines. (English) Zbl 0616.65013 J. Comput. Appl. Math. 15, 161-173 (1986). Reviewer: H.P.Dikshit MSC: 65D10 65D07 PDF BibTeX XML Cite \textit{P. Dierckx}, J. Comput. Appl. Math. 15, 161--173 (1986; Zbl 0616.65013) Full Text: DOI
Tong Vȧn Duc Cohomologies d’algèbres de Lie sur le fibré tangent d’ordre 2. (French) Zbl 0606.57011 Acta Math. Vietnam. 9, No. 1, 65-85 (1984). Reviewer: D.Motreanu MSC: 57R15 53C15 17B56 57R25 PDF BibTeX XML Cite \textit{Tong Vȧn Duc}, Acta Math. Vietnam. 9, No. 1, 65--85 (1984; Zbl 0606.57011)
Zobin, N. M. On extreme mixed norms. (English. Russian original) Zbl 0564.46057 Russ. Math. Surv. 39, No. 2, 217-218 (1984); translation from Usp. Mat. Nauk 39, No. 2(236), 157-158 (1984). Reviewer: J.Rákosník MSC: 46M35 46E35 PDF BibTeX XML Cite \textit{N. M. Zobin}, Russ. Math. Surv. 39, No. 2, 217--218 (1984; Zbl 0564.46057); translation from Usp. Mat. Nauk 39, No. 2(236), 157--158 (1984) Full Text: DOI
Arnold, Douglas N.; Saranen, Jukka On the asymptotic convergence of spline collocation methods for partial differential equations. (English) Zbl 0542.65069 SIAM J. Numer. Anal. 21, 459-472 (1984). Reviewer: G.Vainikko MSC: 65N35 65N15 35J25 PDF BibTeX XML Cite \textit{D. N. Arnold} and \textit{J. Saranen}, SIAM J. Numer. Anal. 21, 459--472 (1984; Zbl 0542.65069) Full Text: DOI
Musielak, Julian Orlicz spaces and modular spaces. (English) Zbl 0557.46020 Lecture Notes in Mathematics. 1034. Berlin etc.: Springer-Verlag. 222 p. DM 28.00; $ 10.90 (1983). Reviewer: Ph.Turpin MSC: 46E30 46E35 46-02 45G10 PDF BibTeX XML Full Text: DOI
Friedlander, F. G. Introduction to the theory of distributions. (English) Zbl 0499.46020 Cambridge etc.: Cambridge University Press. III, 157 p. $ 17.50; £6.95 (1982). MSC: 46F10 46F05 46F12 46-01 35D05 PDF BibTeX XML
Haemmerlin, G. New developments in the numerical treatment of integral equations. (English) Zbl 0519.65082 Numerical mathematics, Proc. 7th South Afr. Symp., Durban 1981, 1-9 (1981). MSC: 65R20 45C05 PDF BibTeX XML
Vershik, A. M.; Gel’fand, I. M.; Graev, M. I. Representations of the group of smooth mappings from a manifold \(X\) into a compact Lie group. (English. Russian original) Zbl 0393.22012 Sov. Math., Dokl. 18, 118-121 (1977); translation from Dokl. Akad. Nauk SSSR 232, 745-748 (1977). MSC: 22E65 22E45 PDF BibTeX XML Cite \textit{A. M. Vershik} et al., Sov. Math., Dokl. 18, 118--121 (1977; Zbl 0393.22012); translation from Dokl. Akad. Nauk SSSR 232, 745--748 (1977)