[Fertility determinants].
D002031:Bulgaria; D003710:Demography; D019049:Developed Countries; D005060:Europe; D005061:Europe, Eastern; D005298:Fertility; D008722:Methods; D011153:Population; D011157:Population Dynamics
Bulgaria; Demographic Factors; Developed Countries; Eastern Europe; Europe; Fertility; Fertility Determinants; Methodological Studies; Population; Population Dynamics
Faktorna obuslovenost na plodovitostta.