@inproceedings{TAPSOFT-1997-MullerNP,
	author        = "Martin Müller 0001 and Joachim Niehren and Andreas Podelski",
	booktitle     = "{Proceedings of the Seventh International Joint Conference on Theory and Practice of Software Development}",
	doi           = "10.1007/BFb0030609",
	isbn          = "3-540-62781-2",
	pages         = "345--356",
	publisher     = "{Springer}",
	title         = "{Inclusion Constraints over Non-empty Sets of Trees}",
	year          = 1997,
}