@article{Popov1993,
author = {Popov, A.A. and Visser, A.P. and Ketting, E.},
title= {Contraceptive knowledge, attitudes, and practice in Russia during the 1980s},
year = {1993},
doi = {10.2307/2939190},
volume = {24},
number = {4},
pages = {227--235},
}