@inproceedings{SIGIR-2010-ZucconAR,
	author        = "Guido Zuccon and Leif Azzopardi and Keith van Rijsbergen",
	booktitle     = "{Proceedings of the 33rd International ACM SIGIR Conference on Research and Development in Information Retrieval}",
	doi           = "10.1145/1835449.1835600",
	isbn          = "978-1-4503-0153-4",
	pages         = "755--756",
	publisher     = "{ACM}",
	title         = "{Has portfolio theory got any principles?}",
	year          = 2010,
}