Frank Drewes, Hans-Jörg Kreowski, Denis Lapoire: Criteria to disprove context freeness of collage languages. Theoretical Computer Science 290:1445-1458, 2003.
Hans-Jörg Kreowski, Sabine Kuske: Approach-independent structuring concepts for rule-based systems. In Martin Wirsing, Dirk Pattison, Rolf Hennicker, editors, Proc. 16th Int. Workshop on Algebraic Development Techniques (WADT 2002), volume 2755 of Lecture Notes in Computer Science, pages 299-311. 2003.
Frank Drewes, Renate Klempien-Hinrichs, Hans-Jörg Kreowski: Table-driven and context-sensitive collage languages. Journal of Automata, Languages and Combinatorics 8:5-24, 2003.
Frank Drewes, Sigrid Ewert, Renate Klempien-Hinrichs, Hans-Jörg Kreowski: Computing Raster Images from Grid Picture Grammars. Journal of Automata, Languages and Combinatorics 8:499-519, 2003.
Hans-Jörg Kreowski: Syntax, Semantik und .... In Karl-Heinz Rödiger, editor, Algorithmik - Kunst - Semiotik - Hommage für Frieder Nake, pages 75-88. Synchron Publishers, 2003.
