title: [Determination of the timing of demographic peaks and lows in Poland: the range of fluctuations in the size of selected age groups].
mesh_terms: D001723:Birth Rate; D003710:Demography; D019049:Developed Countries; D005060:Europe; D005061:Europe, Eastern; D005191:Family Characteristics; D005298:Fertility; D008962:Models, Theoretical; D011044:Poland; D011153:Population; D011156:Population Density; D011157:Population Dynamics; D012106:Research; D012942:Social Sciences; D013997:Time Factors
keywords: Birth Rate--changes; Demographic Factors; Demography; Developed Countries; Eastern Europe; Europe; Family And Household; Family Characteristics; Family Size; Family Size, Ideal; Fertility; Fertility Measurements; Models, Theoretical; Optimum Population; Poland; Population; Population Dynamics; Population Size; Population Theory; Research Methodology; Social Sciences; Time Factors
vernacular_title: Wyznaczanie rocznikow wyzu i nizu demograficznego w Polsce.  Zakres falowania liczebnosci wybranych grup wieku