@inproceedings{VLDB-1979-Pirotte,
	author        = "Alain Pirotte",
	booktitle     = "{Proceedings of the Fifth International Conference on Very Large Data Bases}",
	cdrom         = "VLDB79/P239.PDF",
	pages         = "239--250",
	publisher     = "{IEEE Computer Society}",
	title         = "{Fundamental and Secondary Issues in the Design of Non-Procedural Relational Languages}",
	year          = 1979,
}