@inproceedings {4217,
	title = {Validity and Power of T-Test for Comparing MAP and GMAP},
	booktitle = {International Conference on Research and Development in Information Retrieval (SIGIR)},
	year = {2007},
	doi = {10.1145/1277741.1277892},
	author = {Gordon Cormack and Thomas R. Lynam}
}
