@article{Blanc1991,
author = {Blanc, A.K. and Rutenberg, N.},
title= {Coitus and contraception: the utility of data on sexual intercourse for family planning programs},
year = {1991},
doi = {10.2307/1966643},
journal = {Studies in Family Planning},
volume = {22},
number = {3},
pages = {162--176},
}