Popivanov, Nedyu; Hristov, Tsvetan; Nikolov, Aleksey; Schneider, Manfred Singular solutions to a (3 + 1)-D Protter-Morawetz problem for Keldysh-type equations. (English) Zbl 1404.35300 Adv. Math. Phys. 2017, Article ID 1571959, 16 p. (2017). MSC: 35M12 35A20 35A01 35A02 PDFBibTeX XMLCite \textit{N. Popivanov} et al., Adv. Math. Phys. 2017, Article ID 1571959, 16 p. (2017; Zbl 1404.35300) Full Text: DOI
Popivanov, Nedyu; Hristov, Tsvetan; Nikolov, Aleksey; Schneider, Manfred On the existence and uniqueness of a generalized solution of the Protter problem for \((3+1)\)-D Keldysh-type equations. (English) Zbl 1364.35067 Bound. Value Probl. 2017, Paper No. 26, 30 p. (2017). MSC: 35D30 35M12 35A20 35A02 35A01 PDFBibTeX XMLCite \textit{N. Popivanov} et al., Bound. Value Probl. 2017, Paper No. 26, 30 p. (2017; Zbl 1364.35067) Full Text: DOI
Hristov, T. D.; Popivanov, N. I.; Schneider, M. On the uniqueness of generalized and quasi-regular solutions to equations of mixed type in \(\mathbb{R}^{3}\). (English) Zbl 1515.35162 Sib. Adv. Math. 21, No. 4, 262-273 (2011). MSC: 35M12 35A02 PDFBibTeX XMLCite \textit{T. D. Hristov} et al., Sib. Adv. Math. 21, No. 4, 262--273 (2011; Zbl 1515.35162) Full Text: DOI
Hristov, Tzvetan D.; Popivanov, Nedyu I.; Schneider, Manfred Estimates of singular solutions of Protter’s problem for 3-D hyperbolic equations. (English) Zbl 1120.35062 Commun. Appl. Anal. 10, No. 2-3, 223-251 (2006). Reviewer: Claudia Simionescu-Badea (Wien) MSC: 35L20 35D05 35A20 35L05 35B45 PDFBibTeX XMLCite \textit{T. D. Hristov} et al., Commun. Appl. Anal. 10, No. 2--3, 223--251 (2006; Zbl 1120.35062)
Popivanov, Nedyu Iv.; Schneider, Manfred Nonlocal regularization of Protter problem for the 3-D Tricomi equation. (English) Zbl 0966.35085 Bainov, D. (ed.), Proceedings of the 8th international colloquium on differential equations, Plovdiv, Bulgaria, August 18-23, 1997. Utrecht: VSP. 373-378 (1998). MSC: 35M10 65R30 35R25 PDFBibTeX XMLCite \textit{N. Iv. Popivanov} and \textit{M. Schneider}, in: Proceedings of the 8th international colloquium on differential equations, Plovdiv, Bulgaria, August 18--23, 1997. Utrecht: VSP. 373--378 (1998; Zbl 0966.35085)
Popivanov, N. I.; Schneider, M. On M. H. Protter problems for the wave equation in \(\mathbb{R}^ 3\). (English) Zbl 0835.35083 J. Math. Anal. Appl. 194, No. 1, 50-77 (1995). Reviewer: M.Saigo (Fukuoka) MSC: 35L05 35A20 PDFBibTeX XMLCite \textit{N. I. Popivanov} and \textit{M. Schneider}, J. Math. Anal. Appl. 194, No. 1, 50--77 (1995; Zbl 0835.35083) Full Text: DOI
Popivanov, N. I.; Schneider, M. The Darboux problems in \(\mathbb{R}^ 3\) for a class of degenerating hyperbolic equations. (English) Zbl 0805.35080 J. Math. Anal. Appl. 175, No. 2, 537-578 (1993). MSC: 35L80 35R25 35D05 PDFBibTeX XMLCite \textit{N. I. Popivanov} and \textit{M. Schneider}, J. Math. Anal. Appl. 175, No. 2, 537--578 (1993; Zbl 0805.35080) Full Text: DOI
Popivanov, Nedyu Iv.; Schneider, Manfred Friedrich A boundary-value problem for a nonlinear Tricomi equation in space. (English. Russian original) Zbl 0745.35027 Differ. Equations 27, No. 4, 459-465 (1991); translation from Differ. Uravn. 27, No. 4, 648-655 (1991). Reviewer: M.Kučera (Praha) MSC: 35M10 35D05 35B45 PDFBibTeX XMLCite \textit{N. Iv. Popivanov} and \textit{M. F. Schneider}, Differ. Equations 27, No. 4, 459--465 (1991; Zbl 0745.35027); translation from Differ. Uravn. 27, No. 4, 648--655 (1991)
Popivanov, Nedyu Iv.; Schneider, Manfred Friedrich The Darboux-problem in \(R^ 3\) for a class of degenerated hyperbolic equations. (English) Zbl 0667.35052 C. R. Acad. Bulg. Sci. 41, No. 11, 7-9 (1988). Reviewer: M.Schneider MSC: 35L80 35L20 35A05 35B65 PDFBibTeX XMLCite \textit{N. Iv. Popivanov} and \textit{M. F. Schneider}, C. R. Acad. Bulg. Sci. 41, No. 11, 7--9 (1988; Zbl 0667.35052)