[Specificities of the reproduction of population in the Balkan mountain region].
Borisov
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Z
D001723:Birth Rate; D002031:Bulgaria; D003710:Demography; D019049:Developed Countries; D004641:Emigration and Immigration; D005060:Europe; D005061:Europe, Eastern; D005298:Fertility; D009026:Mortality; D011153:Population; D011157:Population Dynamics
Birth Rate--changes; Bulgaria; Demographic Factors; Developed Countries; Eastern Europe; Europe; Fertility; Fertility Measurements; Migration; Mortality--changes; Population; Population Dynamics