Numerical Analysis and Its Applications Second International Conference, NAA 2000 Rousse, Bulgaria, June 11-15, 2000. Revised Papers - Vulkov, Lubin; Vulkov, Lubin; Wasniewski, Jerzy; Wasniewski, Jerzy; Yalamov, Plamen; Yalamov, Plamen (Springer Berlin Heidelberg : Imprint: Springer, 2001)