Cycles and rays / ed. by Geňa Hahn, Gert Sabidussi and Robert E. WoodrowShape optimization and free boundaries / ed. by Michel C. Delfour and Gert Sabidussi, tech. edAlgebras and orders / ed. by Ivo G. Rosenberg and Gert SabadussiComplex potential theory / ed. by Paul M. Gauthier and Gert SabidussiGraph symmetry : algebraic methods and applications / ed. by Geňa Hahn and Gert SabidussiRepresentation theories and algebraic geometry / ed. by A. Broer ; technical ed. Gert SabidussiTheory and practice of combinatorics : a collection of articles honoring Anton Kotzig on the occasion of his sixtieth birthday / ed. by Alexander Rosa, Gert Sabidussi