title: [The effect of socio-psychological factors on the level of birth rate].
mesh_terms: D001723:Birth Rate; D002031:Bulgaria; D006801:Humans; D011593:Psychology, Social; D012959:Socioeconomic Factors; D012963:Sociometric Techniques
vernacular_title: Za vliianieto na sotsialno-psikhologicheskite faktori vurkhu nivoto na razhdaemostta.