Serdica Bulgariacae mathematicae publicationes

Volume 18, 1992

Number 1-2

• Semenov, P. V. Selections of graphvalued maps. (pp. 3-9)
• Peng, Yee-Hock. Three families of chromatically unique graphs. (pp. 10-16)
• Ivanov, I. G. Parallel numerical algorithm for spectral problem of block Hermitian matrices. (pp. 17-22)
• Jassim, S.K. Direct and inverse inequalities for some discrete operators of bounded measurable functions. (pp. 23-35)
• Toth, J., L. Zsilinszky. Insertion of E_p(l) to L_¥ for the best approximation in Haar's system of functions if 0 < p < 1. (pp. 36-42)
• Dorta Díaz, J. A., J. M. R. Méndez Pérez. Finite Hankel-Clifford transformations of the first kind of arbitrary order. (pp. 43-58)
• Ivanova-Karatopraklieva, I. Infinitesimal bending of higher order of rotational surfaces with a planar pole. (pp. 59-78)
• Gichev, T. R. A class of linear differential equations with unbounded coefficients. I: Properties and solutions. (in Russian) (pp. 79-89)
• Gichev, T. R., R. K. Angelova. A class of linear differential equations with unbounded coefficients. II: Some applications. (in Russian) (pp. 90-98)
• Przemski, M. On some forms of cliquishness on topological spaces. (pp. 99-117)
• Jassim, S. K. Best one-sided approximation and approximation with trigonometric operators in L_p, 0 < p < 1. (pp. 118-128)

Number 3-4

• Choban, M. M. The structure of locally compact algebras. (pp. 129-137)
• Kolikov, K. Kh. On regular crossed products in groups and rings. (in Russian) (pp. 138-143)
• Stanilov, G. On the geometry of almost Hermitian manifolds of constant type. (pp. 144-149)
• Staikova, M. T., K. I. Gribachev. Canonical connections and their conformal invariants on Riemannian almost-product manifolds. (pp. 150-161)
• Abujabal, H. A. S. Commutativity results for one-sided $s$-unital and semi-prime rings. (pp. 162-172)
• Gadag, V. G., M. B. Rajarshi. On processes associated with a super-critical Markov branching process. (pp. 173-178)
• Todorov, M. I. Linear vector optimization. Properties of the efficient sets. (pp. 179-185)
• Dimitrova, J. M. Radicals of crossed products. (pp. 186-195)
• Dimou, G. E. Complete classification of convex cones and skeletons of dimensions seven up to thirteen. (pp. 196-205)
• Dobreva, M., St. Kerpedjiev. Automatic conversion of encyclopedia entries into a hypertext. (pp. 206-214)
• Yalamov, P. Y. Backward error analysis of LU-decomposition for pentadiagonal matrices. (pp. 215-223)
• Daskalov, R. N. Binary linear block codes with improved minimum distance bounds. (pp. 224-231)
• Gal, S. Gh. Calculus of higher order averaged modulus of smoothness in L^p-norm for convex functions of higher order. (pp. 232-239)
• Ignatov, Z. G.; T. M. Mills, I.P. Tzankova. On the rate of approximation of random functions. (pp. 240-247)
• Mishra, S. Integrals involving Bessel polynomials, hypergeometric series and Fox's H-function, and Fourier-Bessel polynomial expansions for products of generalized hypergeometric functions. (pp. 248-259).
• Belger, M. Eigenvalue distribution of invariant linear elliptic differential operators of arbitrary order with constant coefficients. (pp. 260-277)
• Boyvalenkov, P. On the upper bounds for the kissing numbers. (pp. 278-285)
• Mahdi, K. On Sendov's bound for zeros of a polynomial. (pp. 286-292).
• Zarnan, J. A., M. G. Petkov. Two-sided methods for computing the roots of matrices. (pp. 293-298)