title: [The fifth phase of demographic transition: population regression].
mesh_terms: D001723:Birth Rate; D003710:Demography; D009026:Mortality; D011153:Population; D011157:Population Dynamics; D012942:Social Sciences
keywords: Demographic Factors; Demographic Transition; Demography; Fertility Rate; Mortality; Population; Population Decrease; Population Dynamics; Population Theory; Social Sciences
vernacular_title: Piata faza przejscia demograficznego: regres ludnosci