Numerical Analysis and Its Applications First International Workshop, WNAA'96, Rousse, Bulgaria, June 24-26, 1996 Proceedings - Vulkov, Lubin; Vulkov, Lubin; Wasniewski, Jerzy; Wasniewski, Jerzy; Yalamov, Plamen; Yalamov, Plamen (Springer Berlin Heidelberg : Imprint: Springer, 1997)