Graph-Theoretic Concepts in Computer Science 25th International Workshop, WG'99, Ascona, Switzerland, June 17-19, 1999 Proceedings - Widmayer, Peter; Widmayer, Peter; Neyer, Gabriele; Neyer, Gabriele; Eidenbenz, Stephan; Eidenbenz, Stephan (Springer Berlin Heidelberg : Imprint: Springer, 1999)