Theory and Application of Graph Transformations 6th International Workshop, TAGT'98 Paderborn, Germany, November 16-20, 1998 Selected Papers - Ehrig, Hartmut; Ehrig, Hartmut; Engels, Gregor; Engels, Gregor; Kreowski, Hans-Jörg; Kreowski, Hans-Jörg; Rozenberg, Grzegorz; Rozenberg, Grzegorz (Springer Berlin Heidelberg : Imprint: Springer, 2000)