@article{Koytcheva2008,
author = {Koytcheva, E.  and Philipov, D. },
title= {Bulgaria: Ethnic differentials in rapidly declining fertility},
year = {2008},
doi = {10.4054/DemRes.2008.19.13},
journal = {Demographic Research},
volume = {19},
number = {13},
pages = {361--401},
}