@inproceedings{SIGMOD-1975-Schkolnick,
	author        = "Mario Schkolnick",
	booktitle     = "{Proceedings of the Fifth ACM SIGMOD International Conference on Management of Data}",
	cdrom         = "SIGMOD75/P186.PDF",
	doi           = "10.1145/500080.500106",
	pages         = "186--192",
	publisher     = "{ACM}",
	title         = "{Secondary Index Optimization}",
	year          = 1975,
}