Population changes:  contemporary models and theories.
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D000383:Agriculture; D003710:Demography; D003858:Dependency, Psychological; D019049:Developed Countries; D003906:Developing Countries; D004467:Economics; D006115:Greece; D006798:Housing; D007558:Italy; D018803:Models, Economic; D008962:Models, Theoretical; D011153:Population; D011157:Population Dynamics; D011158:Population Growth; D012106:Research; D012939:Social Planning; D012942:Social Sciences; D013030:Spain
Agricultural Development; Demographic Aging; Demographic Factors; Demography; Dependency Burden; Developed Countries; Developing Countries; Development Planning; Economic Development; Economic Factors; Economic Model; Economics; Greece; Housing; Italy; Mathematical Model; Models, Theoretical; Optimum Population; Population; Population Dynamics; Population Growth--changes; Population Theory; Research Methodology; Rural Development; Social Sciences; Spain; World