Fritzsche, Bernd; Kirstein, Bernd; Kley, Susanne; Mädler, Conrad The Weyl matrix balls corresponding to the matricial truncated Hamburger moment problem. (English) Zbl 1503.44005 Linear Algebra Appl. 651, 230-311 (2022). MSC: 44A60 47A57 30E05 PDFBibTeX XMLCite \textit{B. Fritzsche} et al., Linear Algebra Appl. 651, 230--311 (2022; Zbl 1503.44005) Full Text: DOI arXiv
Fritzsche, Bernd; Kirstein, Bernd; Kley, Susanne; Mädler, Conrad Parametrization of the solution set of a matricial truncated hamburger moment problem by a Schur type algorithm. (English) Zbl 1503.30087 Alpay, Daniel (ed.) et al., New directions in function theory: from complex to hypercomplex to non-commutative. Selected papers based on the presentations at the conference, Chapman University, Orange, CA, USA, November 21–26, 2019. Cham: Birkhäuser. Oper. Theory: Adv. Appl. 286, 259-328 (2021). MSC: 30E05 47A56 PDFBibTeX XMLCite \textit{B. Fritzsche} et al., Oper. Theory: Adv. Appl. 286, 259--328 (2021; Zbl 1503.30087) Full Text: DOI
Fritzsche, Bernd; Kirstein, Bernd; Mädler, Conrad A Schur-Nevanlinna type algorithm for the truncated matricial Hausdorff moment problem. (English) Zbl 1472.44005 Complex Anal. Oper. Theory 15, No. 2, Paper No. 25, 130 p. (2021). MSC: 44A60 47A57 30E05 PDFBibTeX XMLCite \textit{B. Fritzsche} et al., Complex Anal. Oper. Theory 15, No. 2, Paper No. 25, 130 p. (2021; Zbl 1472.44005) Full Text: DOI arXiv
Alpay, Daniel; Fritzsche, Bernd; Kirstein, Bernd Editorial introduction. (English) Zbl 1462.01034 Alpay, Daniel (ed.) et al., Complex function theory, operator theory, Schur analysis and systems theory. A volume in honor of V. E. Katsnelson. Cham: Birkhäuser. Oper. Theory: Adv. Appl. 280, 1-8 (2020). MSC: 01A70 PDFBibTeX XMLCite \textit{D. Alpay} et al., Oper. Theory: Adv. Appl. 280, 1--8 (2020; Zbl 1462.01034) Full Text: DOI
Fritzsche, Bernd; Kirstein, Bernd; Mädler, Conrad; Makarevich, Tatsiana A Potapov-type approach to a truncated matricial Stieltjes-type power moment problem. (English) Zbl 1446.30054 Breaz, Daniel (ed.) et al., Advancements in complex analysis. From theory to practice. Cham: Springer. 193-297 (2020). Reviewer: Ilie Valuşescu (Bucureşti) MSC: 30E05 47A56 PDFBibTeX XMLCite \textit{B. Fritzsche} et al., in: Advancements in complex analysis. From theory to practice. Cham: Springer. 193--297 (2020; Zbl 1446.30054) Full Text: DOI arXiv
Fritzsche, Bernd; Kirstein, Bernd; Mädler, Conrad Schur analysis of matricial Hausdorff moment sequences. (English) Zbl 1447.44005 Linear Algebra Appl. 590, 133-209 (2020). MSC: 44A60 PDFBibTeX XMLCite \textit{B. Fritzsche} et al., Linear Algebra Appl. 590, 133--209 (2020; Zbl 1447.44005) Full Text: DOI arXiv
Fritzsche, B.; Kirstein, B.; Roitberg, I. Ya; Sakhnovich, A. L. Continuous and discrete dynamical Schrödinger systems: explicit solutions. (English) Zbl 1387.81207 J. Phys. A, Math. Theor. 51, No. 1, Article ID 015202, 15 p. (2018). MSC: 81Q05 39A12 81U15 37K35 PDFBibTeX XMLCite \textit{B. Fritzsche} et al., J. Phys. A, Math. Theor. 51, No. 1, Article ID 015202, 15 p. (2018; Zbl 1387.81207) Full Text: DOI arXiv
Fritzsche, Bernd; Kirstein, Bernd; Roitberg, Inna; Sakhnovich, Alexander Stability of the procedure of explicit recovery of skew-selfadjoint Dirac systems from rational Weyl matrix functions. (English) Zbl 1373.15025 Linear Algebra Appl. 533, 428-450 (2017). MSC: 15A29 15A16 15A24 93B20 PDFBibTeX XMLCite \textit{B. Fritzsche} et al., Linear Algebra Appl. 533, 428--450 (2017; Zbl 1373.15025) Full Text: DOI arXiv
Fritzsche, Bernd; Kirstein, Bernd; Mädler, Conrad On a simultaneous approach to the even and odd truncated matricial Stieltjes moment problem I: an \(\alpha\)-Schur-Stieltjes-type algorithm for sequences of complex matrices. (English) Zbl 1359.44004 Linear Algebra Appl. 521, 142-216 (2017). MSC: 44A60 47A57 PDFBibTeX XMLCite \textit{B. Fritzsche} et al., Linear Algebra Appl. 521, 142--216 (2017; Zbl 1359.44004) Full Text: DOI arXiv
Fritzsche, B.; Kaashoek, M. A.; Kirstein, B.; Sakhnovich, A. L. Skew-selfadjoint Dirac systems with rational rectangular Weyl functions: explicit solutions of direct and inverse problems and integrable wave equations. (English) Zbl 1376.37111 Math. Nachr. 289, No. 14-15, 1792-1819 (2016). MSC: 37K10 34B20 35Q55 39A12 35R30 34L40 PDFBibTeX XMLCite \textit{B. Fritzsche} et al., Math. Nachr. 289, No. 14--15, 1792--1819 (2016; Zbl 1376.37111) Full Text: DOI arXiv
Fritzsche, Bernd; Kirstein, Bernd; Mädler, Conrad Transformations of matricial \({\alpha}\)-Stieltjes non-negative definite sequences. (English) Zbl 1283.44003 Linear Algebra Appl. 439, No. 12, 3893-3933 (2013). MSC: 44A60 47A57 PDFBibTeX XMLCite \textit{B. Fritzsche} et al., Linear Algebra Appl. 439, No. 12, 3893--3933 (2013; Zbl 1283.44003) Full Text: DOI
Fritzsche, B.; Kirstein, B.; Sakhnovich, A. L. Weyl functions of generalized Dirac systems: integral representation, the inverse problem and discrete interpolation. (English) Zbl 1280.34013 J. Anal. Math. 116, 17-51 (2012). Reviewer: Hubert Kalf (München) MSC: 34A55 34L05 34L25 34L40 PDFBibTeX XMLCite \textit{B. Fritzsche} et al., J. Anal. Math. 116, 17--51 (2012; Zbl 1280.34013) Full Text: DOI
Fritzsche, B.; Kirstein, B.; Roitberg, I. Ya.; Sakhnovich, A. L. Skew-self-adjoint Dirac system with a rectangular matrix potential: Weyl theory, direct and inverse problems. (English) Zbl 1268.34051 Integral Equations Oper. Theory 74, No. 2, 163-187 (2012). Reviewer: Bilender P. Allahverdiev (Isparta) MSC: 34B20 34L40 37K15 PDFBibTeX XMLCite \textit{B. Fritzsche} et al., Integral Equations Oper. Theory 74, No. 2, 163--187 (2012; Zbl 1268.34051) Full Text: DOI arXiv
Fritzsche, Bernd; Kirstein, Bernd; Lasarow, Andreas On canonical solutions of a moment problem for rational matrix-valued functions. (English) Zbl 1257.30027 Arendt, Wolfgang (ed.) et al., Spectral theory, mathematical system theory, evolution equations, differential and difference equations. Selected papers of 21st international workshop on operator theory and applications, IWOTA10, Berlin, Germany, July 12–16, 2010. Basel: Birkhäuser (ISBN 978-3-0348-0296-3/hbk; 978-3-0348-0297-0/ebook). Operator Theory: Advances and Applications 221, 323-372 (2012). MSC: 30E05 42C05 44A60 47A56 PDFBibTeX XMLCite \textit{B. Fritzsche} et al., Oper. Theory: Adv. Appl. 221, 323--372 (2012; Zbl 1257.30027) Full Text: DOI
Fritzsche, B.; Kirstein, B.; Roitberg, I. Ya.; Sakhnovich, A. L. Operator identities corresponding to inverse problems for Dirac systems. (English) Zbl 1277.47062 Indag. Math., New Ser. 23, No. 4, 690-700 (2012). Reviewer: Chuan-Fu Yang (Nanjing) MSC: 47G10 45H05 34L40 47A68 PDFBibTeX XMLCite \textit{B. Fritzsche} et al., Indag. Math., New Ser. 23, No. 4, 690--700 (2012; Zbl 1277.47062) Full Text: DOI arXiv
Fritzsche, Bernd; Kirstein, Bernd; Mädler, Conrad On Hankel nonnegative definite sequences, the canonical Hankel parametrization, and orthogonal matrix polynomials. (English) Zbl 1298.05016 Complex Anal. Oper. Theory 5, No. 2, 447-511 (2011). Reviewer: Florian-Horia Vasilescu (Villeneuve d’Ascq) MSC: 05A10 05A05 47A57 44A60 42C05 15B10 PDFBibTeX XMLCite \textit{B. Fritzsche} et al., Complex Anal. Oper. Theory 5, No. 2, 447--511 (2011; Zbl 1298.05016) Full Text: DOI
Fritzsche, Bernd; Kirstein, Bernd; Raabe, Uwe On the sequences of the Weyl semi-radii associated with matricial Carathéodory and Schur sequences in both nondegenerate and degenerate cases. (English) Zbl 1218.30089 Linear Algebra Appl. 435, No. 4, 778-803 (2011). MSC: 30E05 47A57 47A56 PDFBibTeX XMLCite \textit{B. Fritzsche} et al., Linear Algebra Appl. 435, No. 4, 778--803 (2011; Zbl 1218.30089) Full Text: DOI
Fritzsche, Bernd; Kirstein, Bernd; Raabe, Uwe On an interpolation problem for J-Potapov functions. (English) Zbl 1217.30033 Linear Algebra Appl. 434, No. 3, 741-784 (2011). Reviewer: Thanh Van Nguyen (Toulouse) MSC: 30E05 47A57 PDFBibTeX XMLCite \textit{B. Fritzsche} et al., Linear Algebra Appl. 434, No. 3, 741--784 (2011; Zbl 1217.30033) Full Text: DOI arXiv
Dyukarev, Yuriy M.; Fritzsche, Bernd; Kirstein, Bernd; Mädler, Conrad On truncated matricial Stieltjes type moment problems. (English) Zbl 1211.44007 Complex Anal. Oper. Theory 4, No. 4, 905-951 (2010). Reviewer: Florian-Horia Vasilescu (Villeneuve d’Ascq) MSC: 44A60 47A57 30E05 PDFBibTeX XMLCite \textit{Y. M. Dyukarev} et al., Complex Anal. Oper. Theory 4, No. 4, 905--951 (2010; Zbl 1211.44007) Full Text: DOI
Fritzsche, Bernd; Kirstein, Bernd; Lasarow, Andreas On a class of extremal solutions of a moment problem for rational matrix-valued functions in the nondegenerate case. II. (English) Zbl 1203.47006 J. Comput. Appl. Math. 235, No. 4, 1008-1041 (2010). MSC: 47A56 47A57 30E05 42C05 44A60 PDFBibTeX XMLCite \textit{B. Fritzsche} et al., J. Comput. Appl. Math. 235, No. 4, 1008--1041 (2010; Zbl 1203.47006) Full Text: DOI
Fritzsche, B.; Kirstein, B.; Sakhnovich, A. L. Semiseparable integral operators and explicit solution of an inverse problem for a skew-self-adjoint Dirac-type system. (English) Zbl 1198.34019 Integral Equations Oper. Theory 66, No. 2, 231-251 (2010). MSC: 34A55 34B20 47G10 34A05 PDFBibTeX XMLCite \textit{B. Fritzsche} et al., Integral Equations Oper. Theory 66, No. 2, 231--251 (2010; Zbl 1198.34019) Full Text: DOI arXiv
Fritzsche, Bernd; Kirstein, Bernd; Lasarow, Andreas The matricial Schur problem in both nondegenerate and degenerate cases. (English) Zbl 1171.47013 Math. Nachr. 282, No. 2, 180-210 (2009). Reviewer: Ilie Valuşescu (Bucureşti) MSC: 47A57 30E05 PDFBibTeX XMLCite \textit{B. Fritzsche} et al., Math. Nachr. 282, No. 2, 180--210 (2009; Zbl 1171.47013) Full Text: DOI
Fritzsche, Bernd; Kirstein, Bernd; Lasarow, Andreas On a class of extremal solutions of the nondegenerate matricial Carathéodory problem. (English) Zbl 1151.30027 Analysis, München 27, No. 1, 109-164 (2007). Reviewer: Ilie Valuşescu (Bucureşti) MSC: 30E05 47A56 PDFBibTeX XMLCite \textit{B. Fritzsche} et al., Analysis, München 27, No. 1, 109--164 (2007; Zbl 1151.30027) Full Text: DOI
Fritzsche, Bernd; Kirstein, Bernd; Sakhnovich, Alexander Completion problems and scattering problems for Dirac type differential equations with singularities. (English) Zbl 1162.34365 J. Math. Anal. Appl. 317, No. 2, 510-525 (2006). MSC: 34L40 34A55 34L25 PDFBibTeX XMLCite \textit{B. Fritzsche} et al., J. Math. Anal. Appl. 317, No. 2, 510--525 (2006; Zbl 1162.34365) Full Text: DOI arXiv
Fritzsche, Bernd; Kirstein, Bernd; Lasarow, Andreas On Hilbert modules of rational matrix-valued functions and related inverse problems. (English) Zbl 1108.47018 J. Comput. Appl. Math. 179, No. 1-2, 215-248 (2005). Reviewer: Alan L. Andrew (Bundoora) MSC: 47A57 47A56 30E05 47B32 42C05 44A60 46E22 PDFBibTeX XMLCite \textit{B. Fritzsche} et al., J. Comput. Appl. Math. 179, No. 1--2, 215--248 (2005; Zbl 1108.47018) Full Text: DOI
Fritzsche, Bernd; Kirstein, Bernd; Mosch, Mirko On block completion problems for Arov-normalized \(j_{qq}-J_{q}\)-elementary factors. (English) Zbl 0999.47014 Linear Algebra Appl. 346, No. 1-3, 273-291 (2002). Reviewer: Mihai Putinar (Santa Barbara) MSC: 47A57 30E05 47A56 PDFBibTeX XMLCite \textit{B. Fritzsche} et al., Linear Algebra Appl. 346, No. 1--3, 273--291 (2002; Zbl 0999.47014) Full Text: DOI
Fritzsche, B.; Fuchs, S.; Kirstein, B. On subclasses of the Carathéodory class with matricial extremal property. (English) Zbl 0932.47012 Optimization 45, No. 1-4, 31-56 (1999). Reviewer: Mihai Putinar (Santa Barbara) MSC: 47A57 60G10 30E05 60G25 PDFBibTeX XMLCite \textit{B. Fritzsche} et al., Optimization 45, No. 1--4, 31--56 (1999; Zbl 0932.47012) Full Text: DOI
Fritzsche, B.; Kirstein, B.; Müller, K. An analysis of the block structure of certain subclasses of \(j_{qq}\)-inner functions. (English) Zbl 0906.30030 Z. Anal. Anwend. 17, No. 2, 459-478 (1998). Reviewer: V.Burjan (Praha) MSC: 30E05 47A57 PDFBibTeX XMLCite \textit{B. Fritzsche} et al., Z. Anal. Anwend. 17, No. 2, 459--478 (1998; Zbl 0906.30030) Full Text: DOI
Arov, D. Z.; Fritzsche, B.; Kirstein, B. A function-theoretic approach to a parametrization of the set of solutions of a completely indeterminate matricial Nehari problem. (English) Zbl 0897.30016 Integral Equations Oper. Theory 30, No. 1, 1-66 (1998). Reviewer: T.Nakazi (Sapporo) MSC: 30E05 47A57 PDFBibTeX XMLCite \textit{D. Z. Arov} et al., Integral Equations Oper. Theory 30, No. 1, 1--66 (1998; Zbl 0897.30016) Full Text: DOI
Fritzsche, B.; Kirstein, B.; Müller, K. A block completion problem for matrix-valued inner functions. (English) Zbl 0868.15016 J. Comput. Appl. Math. 77, No. 1-2, 157-172 (1997). Reviewer: H.-J.Kowalsky (Braunschweig) MSC: 15B57 PDFBibTeX XMLCite \textit{B. Fritzsche} et al., J. Comput. Appl. Math. 77, No. 1--2, 157--172 (1997; Zbl 0868.15016) Full Text: DOI
Fritzsche, Bernd; Fuchs, Stefan; Kirstein, Bernd On Arov-normalized \(j_{pq}\)-elementary factors. (English) Zbl 0878.15017 J. Comput. Appl. Math. 77, No. 1-2, 129-156 (1997). Reviewer: W.Wiȩsław (Wrocław) MSC: 15B57 15A54 PDFBibTeX XMLCite \textit{B. Fritzsche} et al., J. Comput. Appl. Math. 77, No. 1--2, 129--156 (1997; Zbl 0878.15017) Full Text: DOI
Fritzsche, Bernd; Kirstein, Bernd; Krug, Vera On Arov-normalized \(j_{qq}-J_q\)-elementary factors. (English) Zbl 0959.47009 Linear Algebra Appl. 267, 11-40 (1997). Reviewer: Mihai Putinar (Santa Barbara) MSC: 47A57 46C20 PDFBibTeX XMLCite \textit{B. Fritzsche} et al., Linear Algebra Appl. 267, 11--40 (1997; Zbl 0959.47009)
Fritzsche, B.; Kirstein, B. On some interrelations between the generalized Nehari problem for the Carathéodory class and prediction theory. (English) Zbl 1092.47502 Z. Anal. Anwend. 16, No. 1, 165-189 (1997). MSC: 47A57 30E05 60G25 60G10 PDFBibTeX XMLCite \textit{B. Fritzsche} and \textit{B. Kirstein}, Z. Anal. Anwend. 16, No. 1, 165--189 (1997; Zbl 1092.47502) Full Text: DOI
Fritzsche, Bernd; Fuchs, Stefan H.; Kirstein, Bernd On resolvent matrices for nondegenerate matricial Schur problems. (English) Zbl 0857.15017 Linear Algebra Appl. 235, 191-220 (1996). Reviewer: J.Zemánek (Warszawa) MSC: 15A54 PDFBibTeX XMLCite \textit{B. Fritzsche} et al., Linear Algebra Appl. 235, 191--220 (1996; Zbl 0857.15017) Full Text: DOI
Fritzsche, Bernd; Kirstein, Bernd; Krug, Vera Carathéodory sequence parametrizations of Potapov-normalized full-rank \(J_ q\)-elementary factors. (English) Zbl 0822.47018 Linear Algebra Appl. 214, 145-185 (1995). MSC: 47A57 PDFBibTeX XMLCite \textit{B. Fritzsche} et al., Linear Algebra Appl. 214, 145--185 (1995; Zbl 0822.47018) Full Text: DOI
Fritzsche, Bernd; Kirstein, Bernd A stochastic characterization of Arov-completable matrix-valued Schur functions. (English) Zbl 0904.47012 Math. Nachr. 169, 135-148 (1994). MSC: 47A57 47A56 60G25 60G10 PDFBibTeX XMLCite \textit{B. Fritzsche} and \textit{B. Kirstein}, Math. Nachr. 169, 135--148 (1994; Zbl 0904.47012) Full Text: DOI
Arov, D. Z.; Fritzsche, B.; Kirstein, B. On block completion problems for \(j_{qq}-J_ q\)-inner functions. II: The case of a given \(q\times q\) block. (English) Zbl 0831.47012 Integral Equations Oper. Theory 18, No. 3, 245-260 (1994). MSC: 47A57 47A56 30E05 47B50 PDFBibTeX XMLCite \textit{D. Z. Arov} et al., Integral Equations Oper. Theory 18, No. 3, 245--260 (1994; Zbl 0831.47012) Full Text: DOI
Arov, D. Z.; Fritzsche, B.; Kirstein, B. On block completion problems for \(j_{qq}-J_ q\)-inner functions. I: The case of a given block column. (English) Zbl 0807.30027 Integral Equations Oper. Theory 18, No. 1, 1-29 (1994). Reviewer: B.Fritzsche (Basel) MSC: 30E05 PDFBibTeX XMLCite \textit{D. Z. Arov} et al., Integral Equations Oper. Theory 18, No. 1, 1--29 (1994; Zbl 0807.30027) Full Text: DOI
Dubovoj, V. K.; Fritzsche, B.; Kirstein, B. On spectrally associated Schur functions, Arov-inner functions and a Nehari-type completion problem for Schur functions. (English) Zbl 0794.47010 Integral Equations Oper. Theory 17, No. 2, 247-276 (1993). MSC: 47A57 47A56 PDFBibTeX XMLCite \textit{V. K. Dubovoj} et al., Integral Equations Oper. Theory 17, No. 2, 247--276 (1993; Zbl 0794.47010) Full Text: DOI
Arov, D. Z.; Fritzsche, B.; Kirstein, B. Completion problems for \(j_{pq}\)-inner functions. II. (English) Zbl 0782.30028 Integral Equations Oper. Theory 16, No. 4, 453-495 (1993). MSC: 30E05 PDFBibTeX XMLCite \textit{D. Z. Arov} et al., Integral Equations Oper. Theory 16, No. 4, 453--495 (1993; Zbl 0782.30028) Full Text: DOI
Arov, D. Z.; Fritzsche, B.; Kirstein, B. Completion problems for \(j_{pq}\)-inner functions. I. (English) Zbl 0781.70008 Integral Equations Oper. Theory 16, No. 2, 155-185 (1993). Reviewer: Victor E.Katsnelson (Kharkov) MSC: 70E05 PDFBibTeX XMLCite \textit{D. Z. Arov} et al., Integral Equations Oper. Theory 16, No. 2, 155--185 (1993; Zbl 0781.70008) Full Text: DOI
Fritzsche, Bernd; Kirstein, Bernd Inverse problems for positive Hermitian block Toeplitz matrices and nondegenerate Schur sequences. (English) Zbl 0813.15018 Linear Algebra Appl. 179, 237-270 (1993). MSC: 15B57 15A54 PDFBibTeX XMLCite \textit{B. Fritzsche} and \textit{B. Kirstein}, Linear Algebra Appl. 179, 237--270 (1993; Zbl 0813.15018) Full Text: DOI
Fritzsche, Bernd; Fuchs, Stefan; Kirstein, Bernd A Schur type matrix extension problem. VI. (English) Zbl 0782.15004 Math. Nachr. 159, 101-138 (1992). Reviewer: H.-J.Kowalsky (Braunschweig) MSC: 15A15 PDFBibTeX XMLCite \textit{B. Fritzsche} et al., Math. Nachr. 159, 101--138 (1992; Zbl 0782.15004) Full Text: DOI
Apitzsch, W.; Fritzsche, B.; Kirstein, B. A Schur analysis approach to maximum distance problems in Hilbert space and prediction. (English) Zbl 0724.47005 Optimization 21, No. 6, 879-904 (1990). Reviewer: T.Nakazi (Sapporo) MSC: 47A20 47A68 15A23 60G10 60G25 PDFBibTeX XMLCite \textit{W. Apitzsch} et al., Optimization 21, No. 6, 879--904 (1990; Zbl 0724.47005) Full Text: DOI
Fritzsche, Bernd; Kirstein, Bernd A Schur type matrix extension problem. IV. (English) Zbl 0712.15026 Math. Nachr. 147, 235-258 (1990). Reviewer: H.-J.Kowalsky MSC: 15A60 15A15 15B48 47A20 15B51 PDFBibTeX XMLCite \textit{B. Fritzsche} and \textit{B. Kirstein}, Math. Nachr. 147, 235--258 (1990; Zbl 0712.15026) Full Text: DOI
Fritzsche, B.; Kirstein, B. A Schur parametrization of non-negative Hermitian and contractive block matrices and the corresponding maximum entropy problems. (English) Zbl 0658.15009 Optimization 19, No. 5, 737-755 (1988). Reviewer: S.Sridhar MSC: 15A23 PDFBibTeX XMLCite \textit{B. Fritzsche} and \textit{B. Kirstein}, Optimization 19, No. 5, 737--755 (1988; Zbl 0658.15009) Full Text: DOI
Fritzsche, B.; Kirstein, B. A matrix extension problem with entropy optimization. (English) Zbl 0643.15003 Optimization 19, No. 1, 85-99 (1988). Reviewer: S.Sridhar MSC: 15A23 60G10 60G25 PDFBibTeX XMLCite \textit{B. Fritzsche} and \textit{B. Kirstein}, Optimization 19, No. 1, 85--99 (1988; Zbl 0643.15003) Full Text: DOI