@inproceedings{GG-1990-Engels,
author = "Gregor Engels",
booktitle = "{Proceedings of the Fourth International Workshop on Graph-Grammars and Their Application to Computer Science}",
doi = "10.1007/BFb0017399",
editor = "Hartmut Ehrig and Hans-Jörg Kreowski and Grzegorz Rozenberg",
isbn = "3-540-54478-X",
pages = "344--362",
publisher = "{Springer-Verlag}",
series = "{Lecture Notes in Computer Science}",
title = "{Elementary Actions on an Extended Entity-Relationship Database}",
volume = 532,
year = 1990,
}
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