@phdthesis{Koytcheva2006,
author = {Koytcheva, E.N.},
title= {Social-Demographic Differences of Fertility and Union Formation in Bulgaria Before and After the Start of the Societal Transition},
year = {2006},
type = {Ph.D. Thesis},
address = {Rostock},
institution = {Max Planck Institute for Demographic Research},
}