@article{Downs1996,
author = {Downs, A. and De Vincenzi, I.},
title= {Probability of heterosexual transmission of HIV: relationship to the number of unprotected sexual contacts},
year = {1996},
doi = {10.1097/00042560-199604010-00010},
journal = {Journal of Acquired Immune Deficiency Syndromes},
volume = {11},
number = {4},
pages = {388--395},
}