@article{Singh2010,
author = {Singh, S. and Sedgh, G. and Hussain, R. },
title= {Unintended Pregnancy: Worldwide Levels, Trends, and Outcomes},
year = {2010},
doi = {10.1111/j.1728-4465.2010.00250.x},
journal = {Studies in Family Planning },
volume = {41},
pages = {241--250},
}