@inproceedings{SIGMOD-1981-Levin,
	author        = "M. Levin",
	booktitle     = "{Proceedings of the 11th ACM SIGMOD International Conference on Management of Data}",
	cdrom         = "SIGMOD81/P040.PDF",
	doi           = "10.1145/582318.582325",
	pages         = "40--48",
	publisher     = "{ACM Press}",
	title         = "{Introduction to the DIAM Theory of Algebraic Access Graph}",
	year          = 1981,
}