@article{Gage1997,
author = {Gage, A.J. and Sommerfelt, A.E. and Piani, A.L.},
title= {Household structure and childhood immunization in Niger and Nigeria},
year = {1997},
doi = {10.2307/2061706},
volume = {34},
number = {2},
pages = {295‒309},
}