@inproceedings{SIGIR-2015-Drutsa,
	author        = "Alexey Drutsa",
	booktitle     = "{Proceedings of the 38th International ACM SIGIR Conference on Research and Development in Information Retrieval}",
	doi           = "10.1145/2766462.2767814",
	isbn          = "978-1-4503-3621-5",
	pages         = "779--782",
	publisher     = "{ACM}",
	title         = "{Sign-Aware Periodicity Metrics of User Engagement for Online Search Quality Evaluation}",
	year          = 2015,
}