Čobanov, Georgi I. Supersolutions for a weakly nonlinear elliptic boundary value problem. (English) Zbl 0764.35042 God. Sofij. Univ. ”Kliment Okhridski”, Fak. Mat. Mekh. 80(1986), No. 1 (Mat.), 133-139 (1991). MSC: 35J85 35J65 PDFBibTeX XMLCite \textit{G. I. Čobanov}, God. Sofiĭ. Univ., Fak. Mat. Mekh. 80, No. 1 (Mat.), 133--139 (1991; Zbl 0764.35042)
Popivanov, Nediu Investigation of some boundary value problems for hyperbolic systems. (Russian. English summary) Zbl 0764.35059 God. Sofij. Univ. ”Kliment Okhridski”, Fak. Mat. Mekh. 80(1986), No. 1 (Mat.), 119-131 (1991). MSC: 35L50 PDFBibTeX XMLCite \textit{N. Popivanov}, God. Sofiĭ. Univ., Fak. Mat. Mekh. 80, No. 1 (Mat.), 119--131 (1991; Zbl 0764.35059)
Karadzhov, Georgi Asymptotic of the spectral function on the diagonal for a class of globally elliptic operators in \(\mathbb{R}{}^ n\). (Russian. English summary) Zbl 0787.35132 God. Sofij. Univ. “Kliment Okhridski”, Fak. Mat. Mekh. 80(1986), No. 1 (Mat.), 69-101 (1991). MSC: 35S05 47G30 35P20 PDFBibTeX XMLCite \textit{G. Karadzhov}, God. Sofiĭ. Univ., Fak. Mat. Mekh. 80, No. 1 (Mat.), 69--101 (1991; Zbl 0787.35132)
Khristov, Khristo; Zheleva, Ivanka On the generalized Boussinesq approximation for flows of reacting mixtures. (English) Zbl 0711.76109 God. Sofij. Univ. “Kliment Okhridski”, Fak. Mat. Mekh. 79(1985), No. 2, 247-252 (1989). MSC: 76V05 80A20 35Q35 PDFBibTeX XMLCite \textit{K. Khristov} and \textit{I. Zheleva}, God. Sofiĭ. Univ., Fak. Mat. Mekh. 79, No. 2, 247--252 (1989; Zbl 0711.76109)
Popivanov, Nedyu Weak and strong solutions of boundary value problems. (Russian. English summary) Zbl 0773.35011 God. Sofij. Univ., Fak. Mat. Mekh. 78(1984), No. 1, 143-157 (1988). MSC: 35D05 35J45 PDFBibTeX XMLCite \textit{N. Popivanov}, God. Sofiĭ. Univ., Fak. Mat. Mekh. 78, No. 1, 143--157 (1988; Zbl 0773.35011)
Kutev, Nikolaj On the solvability of Monge-Ampère type equations. (English) Zbl 0757.35021 God. Sofij. Univ., Fak. Mat. Mekh. 78(1984), No. 1, 137-142 (1988). Reviewer: J.Urbas (Canberra) MSC: 35J60 35J65 PDFBibTeX XMLCite \textit{N. Kutev}, God. Sofiĭ. Univ., Fak. Mat. Mekh. 78, No. 1, 137--142 (1988; Zbl 0757.35021)
Boev, Toshko A class of pseudodifferential operators. (English) Zbl 0752.35097 God. Sofij. Univ., Fak. Mat. Mekh. 78(1984), No. 1, 30-39 (1988). Reviewer: B.Helffer (Paris) MSC: 35S05 PDFBibTeX XMLCite \textit{T. Boev}, God. Sofiĭ. Univ., Fak. Mat. Mekh. 78, No. 1, 30--39 (1988; Zbl 0752.35097)
Popov, Georgi S. Asymptotics of some spectral characteristics of elliptic systems of differential operators. (English) Zbl 0752.35039 God. Sofij. Univ., Fak. Mat. Mekh. 78(1984), No. 1, 15-26 (1988). MSC: 35P20 35J15 35S05 PDFBibTeX XMLCite \textit{G. S. Popov}, God. Sofiĭ. Univ., Fak. Mat. Mekh. 78, No. 1, 15--26 (1988; Zbl 0752.35039)
Jotova, Angelina Explicit evaluation of element matrices for quadratic triangular finite elements. (Bulgarian. English summary) Zbl 0731.65086 God. Sofij. Univ., Fak. Mat. Mekh. 77(1983), No. 1, 17-23 (1988). MSC: 65M60 74S05 35K15 65F30 PDFBibTeX XMLCite \textit{A. Jotova}, God. Sofiĭ. Univ., Fak. Mat. Mekh. 77, No. 1, 17--23 (1988; Zbl 0731.65086)
Khristov, Khristo Ivanov Perturbation of a linear temperature field in an unbounded matrix due to the presence of two unequal non-overlapping spheres. (English) Zbl 0693.73004 God. Sofij. Univ., Fak. Mat. Mekh. 78(1984), No. 2, 149-163 (1988). MSC: 74A15 74E05 80A20 35C10 35J05 PDFBibTeX XMLCite \textit{K. I. Khristov}, God. Sofiĭ. Univ., Fak. Mat. Mekh. 78, No. 2, 149--163 (1988; Zbl 0693.73004)
Karatopraklieva, Maria On a boundary value problem for an equation of mixed type with discontinuous coefficients. II: Existence of the solution. (Russian. English summary) Zbl 0850.35066 God. Sofij. Univ., Fak. Mat. Mekh. 77(1983), No. 1, 51-72 (1988). MSC: 35M10 35R05 PDFBibTeX XMLCite \textit{M. Karatopraklieva}, God. Sofiĭ. Univ., Fak. Mat. Mekh. 77, No. 1, 51--72 (1988; Zbl 0850.35066)
Karatopraklieva, Maria On a boundary value problem for an equation of mixed type with discontinuous coefficients. I: Uniqueness of the solution. (Russian. English summary) Zbl 0850.35065 God. Sofij. Univ., Fak. Mat. Mekh. 77(1983), No. 1, 37-50 (1988). MSC: 35M10 35R05 PDFBibTeX XMLCite \textit{M. Karatopraklieva}, God. Sofiĭ. Univ., Fak. Mat. Mekh. 77, No. 1, 37--50 (1988; Zbl 0850.35065)
Chobanov, Georgi A note on the existence for a nonresonance elliptic problem. (English) Zbl 0761.35032 God. Sofij. Univ., Fak. Mat. Mekh. 77(1983), No. 1, 33-36 (1988). Reviewer: I.Stra\=skraba MSC: 35J65 35J20 35B20 35J05 PDFBibTeX XMLCite \textit{G. Chobanov}, God. Sofiĭ. Univ., Fak. Mat. Mekh. 77, No. 1, 33--36 (1988; Zbl 0761.35032)
Chobanov, Georgi Variational inequalities with Landesman-Lazer conditions. (English) Zbl 0788.35053 God. Sofij. Univ., Fak. Mat. Mekh. 77(1983), No. 1, 25-31 (1988). MSC: 35J85 35A05 PDFBibTeX XMLCite \textit{G. Chobanov}, God. Sofiĭ. Univ., Fak. Mat. Mekh. 77, No. 1, 25--31 (1988; Zbl 0788.35053)
Khristov, Evgeni Kh. On expansions over products of solutions of two Schrödinger equations on semiaxis. II. Perturbation theory. (Russian. English summary) Zbl 0658.35020 God. Sofij. Univ., Fak. Mat. Mekh. 76(1982), No. 2, 191-207 (1987). MSC: 35J10 35B20 35P25 PDFBibTeX XMLCite \textit{E. Kh. Khristov}, God. Sofiĭ. Univ., Fak. Mat. Mekh. 76, No. 2, 191--207 (1987; Zbl 0658.35020)
Khristov, Evgeni Khr. On expansions over products of solutions of two Schrödinger equations on the semiaxis. I: Integral representations. (Russian. English summary) Zbl 0658.35019 God. Sofij. Univ., Fak. Mat. Mekh. 76(1982), No. 2, 167-190 (1987). MSC: 35J10 35A30 35C15 PDFBibTeX XMLCite \textit{E. Khr. Khristov}, God. Sofiĭ. Univ., Fak. Mat. Mekh. 76, No. 2, 167--190 (1987; Zbl 0658.35019)
Ho Shy Hung The Sturm-Liouville problem for a class of nonlinear elliptic equations in unbounded domains. (Bulgarian. Russian, English summaries) Zbl 0647.35066 God. Sofij. Univ., Fak. Mat. Mekh. 76(1982), No. 1, 75-89 (1987). MSC: 35P30 35D05 35J65 35J25 PDFBibTeX XMLCite \textit{Ho Shy Hung}, God. Sofiĭ. Univ., Fak. Mat. Mekh. 76, No. 1, 75--89 (1987; Zbl 0647.35066)
Popivanov, Peter On the solvability of the linear partial differential operators with constant coefficients in the class of generalized periodic functions. (Bulgarian. Russian, English summaries) Zbl 0647.35011 God. Sofij. Univ., Fak. Mat. Mekh. 76(1982), No. 1, 41-49 (1987). MSC: 35E20 35B10 46F05 65H10 PDFBibTeX XMLCite \textit{P. Popivanov}, God. Sofiĭ. Univ., Fak. Mat. Mekh. 76, No. 1, 41--49 (1987; Zbl 0647.35011)
Iliev, Iliya D. Smooth solutions of some nonhypoelliptic equations. (Bulgarian. English summary) Zbl 0636.35013 God. Sofij. Univ., Fak. Mat. Mekh. 73(1979), 93-96 (1986). MSC: 35B65 35G05 PDFBibTeX XMLCite \textit{I. D. Iliev}, God. Sofiĭ. Univ., Fak. Mat. Mekh. 73, 93--96 (1986; Zbl 0636.35013)
Kutev, Nikolaj D. On Neumann’s problem for a class of quasilinear equations of second order with non-negative characteristic form. (Bulgarian. English, Russian summaries) Zbl 0619.35025 God. Sofij. Univ., Fak. Mat. Mekh. 74(1980), 145-164 (1986). MSC: 35G30 35A35 PDFBibTeX XMLCite \textit{N. D. Kutev}, God. Sofiĭ. Univ., Fak. Mat. Mekh. 74, 145--164 (1986; Zbl 0619.35025)
Kutev, Nikolaj D. On some boundary value problems for a class of quasilinear degenerate parabolic equations. (English) Zbl 0563.35040 God. Sofij. Univ., Fak. Mat. Mekh. 75(1981), 97-114 (1984). Reviewer: I.Onciulescu MSC: 35K60 35K20 35A05 PDFBibTeX XMLCite \textit{N. D. Kutev}, God. Sofiĭ. Univ., Fak. Mat. Mekh. 75, 97--114 (1984; Zbl 0563.35040)
Popivanov, Pet”r; Georgiev, Chavdar A necessary condition for local solvability of an operator with double characteristics. (Bulgarian. English summary) Zbl 0558.35082 God. Sofij. Univ., Fak. Mat. Mekh. 75(1981), 57-71 (1984). MSC: 35S05 35A30 35A05 35B45 PDFBibTeX XMLCite \textit{P. Popivanov} and \textit{C. Georgiev}, God. Sofiĭ. Univ., Fak. Mat. Mekh. 75, 57--71 (1984; Zbl 0558.35082)
Paskalev, G.; Chobanov, I. On the exact solution of the Navier-Stokes equations in the semi-space in the presence of a source axis. (Bulgarian) Zbl 0522.76028 God. Sofij. Univ., Fak. Mat. Mekh. 70(1975/76), 27-45 (1981). MSC: 76D05 35C99 PDFBibTeX XMLCite \textit{G. Paskalev} and \textit{I. Chobanov}, God. Sofiĭ. Univ., Fak. Mat. Mekh. 70, 27--45 (1981; Zbl 0522.76028)
Slavchev, Slavcho G. Unsteady motion of a sphere from rest in a viscous incompressible fluid. (Russian) Zbl 0444.76021 God. Sofij. Univ., Fak. Mat. Mekh. 69(1974/1975), 21-30 (1979). MSC: 76D05 35C20 35C99 PDFBibTeX XMLCite \textit{S. G. Slavchev}, God. Sofiĭ. Univ., Fak. Mat. Mekh. 69, 21--30 (1979; Zbl 0444.76021)
Chobanov, Georgi I. On the Dirichlet problem for a class of second order quasi-linear equations with non-negative characteristic form. (Bulgarian) Zbl 0442.35028 God. Sofij. Univ., Fak. Mat. Mekh. 69(1974/1975), 119-140 (1979). MSC: 35G30 35A05 35B45 35K70 PDFBibTeX XMLCite \textit{G. I. Chobanov}, God. Sofiĭ. Univ., Fak. Mat. Mekh. 69, 119--140 (1979; Zbl 0442.35028)
Iordanov, Iordan Régularité de la solution d’une inéquation variationnelle elliptique à deux contraintes. (Bulgarian. French summary) Zbl 0354.35016 God. Sofij. Univ., Fak. Mat. Mekh. 67(1972/1973), 169-190 (1976). MSC: 35D99 35B65 35J20 PDFBibTeX XMLCite \textit{I. Iordanov}, God. Sofiĭ. Univ., Fak. Mat. Mekh. 67, 169--190 (1976; Zbl 0354.35016)
Petkov, Veselin M.; Kutev, Nikolai D. Sur les systemes regulierement hyperboliques du premier ordre. (Russian) Zbl 0353.35061 God. Sofij. Univ., Fak. Mat. Mekh. 67(1972/1973), 375-389 (1976). MSC: 35L40 35L45 35A05 PDFBibTeX XMLCite \textit{V. M. Petkov} and \textit{N. D. Kutev}, God. Sofiĭ. Univ., Fak. Mat. Mekh. 67, 375--389 (1976; Zbl 0353.35061)
Popivanov, Nedju I. On a certain class of degenerate multidimensional hyperbolic equations. (Russian) Zbl 0353.35060 God. Sofij. Univ., Fak. Mat. Mekh. 67(1972/1973), 451-470 (1976). MSC: 35L20 35L10 35D05 PDFBibTeX XMLCite \textit{N. I. Popivanov}, God. Sofiĭ. Univ., Fak. Mat. Mekh. 67, 451--470 (1976; Zbl 0353.35060)
Deneva, Sonja Sur la resolubilite du probleme de Dirichlet avec une fonction de frontiere possedante une singularite de puissance. (Bulgarian) Zbl 0353.35037 God. Sofij. Univ., Fak. Mat. Mekh. 67(1972/1973), 411-419 (1976). MSC: 35J25 35A05 PDFBibTeX XMLCite \textit{S. Deneva}, God. Sofiĭ. Univ., Fak. Mat. Mekh. 67, 411--419 (1976; Zbl 0353.35037)