@article{Gray2001,
author = {Gray, R. and Wawer, M. and Brookmeyer, R. and Sewankambo, N. and Serwadda, D. and Wabwire-Mangen, F. and Lutalo, T. and Li, X. and van Cott, T. and Quinn, T.},
title= {Probability of HIV-1 transmission per coital act in monogamous, heterosexual, HIV-1-discordant couples in Rakai, Uganda},
year = {2001},
doi = {10.1016/S0140-6736(00)04331-2},
journal = {Lancet},
volume = {357},
pages = {1149--1153},
}