@phdthesis{instance1547,
	 title = {{VH-Graphs - a new approach to hierarchical graphs and their application to object-oriented programming}},
	 author = {Mathias Richter},
	 year = {1997},
	 school = {University of Zurich, Department of Informatics},
	 Date-Added = {2026-08-02 22:38:36},
	 Date-Modified = {2026-08-03 07:32:24}
}