A. Habel;H.-J. Kreowski;W. Vogler
Univ. Bremen, Bremen, West Germany;Univ. Bremen, Bremen, West Germany;Technische Univ. Mu¨nchen, Mu¨nchen, West Germany
The complexity of connectivity problems on context-free graph languages
Journal of Computer and System Sciences
(UN-)DECIDABILITY OF GEOMETRIC PROPERTIES OF PICTURES GENERATED BY COLLAGE GRAMMARS
Fundamenta Informaticae