title: Sudden changes in demographic processes:  two applications of catastrophic theory.
authors.forename: R
authors.initials: R
authors.lastname: Domanski
mesh_terms: D003710:Demography; D019049:Developed Countries; D004641:Emigration and Immigration; D005060:Europe; D005061:Europe, Eastern; D005843:Geography; D008962:Models, Theoretical; D011044:Poland; D011153:Population; D011154:Population Characteristics; D011157:Population Dynamics; D014505:Urban Population; D014507:Urbanization
keywords: Demographic Factors; Developed Countries; Eastern Europe; Europe; Geographic Factors; Migration; Poland; Population; Population Characteristics; Population Dynamics; Rural-urban Migration; Spatial Distribution; Theoretical Studies; Urban Population; Urban Spatial Distribution; Urbanization