@article{Bertrand2001,
author = {Bertrand, J. and Seiber, E. and Escudero, G.},
title= {Contraceptive Dynamics in Guatemala: 1978-1998},
year = {2001},
doi = {10.2307/2673832},
journal = {International Family Planning Perspectives},
volume = {27},
number = {3},
pages = {112--118, 136},
}