@inproceedings{SIGMOD-1976-DeheneffeH,
	author        = "Claude Deheneffe and Henri Hennebert",
	booktitle     = "{Proceedings of the Sixth ACM SIGMOD International Conference on Management of Data}",
	cdrom         = "SIGMOD76/P135.PDF",
	doi           = "10.1145/509383.509402",
	pages         = "135--142",
	publisher     = "{ACM}",
	title         = "{NUL: A Navigational User’s Language for a Network Structured Data Base}",
	year          = 1976,
}