@inproceedings{GG-1978-Pratt,
	author        = "Terrence W. Pratt",
	booktitle     = "{Proceedings of the First International Workshop on Graph-Grammars and Their Application to Computer Science and Biology}",
	doi           = "10.1007/BFb0025735",
	editor        = "Volker Claus and Hartmut Ehrig and Grzegorz Rozenberg",
	isbn          = "3-540-09525-X",
	pages         = "389--400",
	publisher     = "{Springer-Verlag}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Definition of Programming Language Semantics Using Grammars for Hierarchical Graphs}",
	volume        = 73,
	year          = 1978,
}