00000nam a2200000 a 4500 Birg, Herwig aut Verfasser/-in Bevölkerungsentwicklung Prognose Aufsatzsammlung World population projections for the 21st century theoretical interpretations and quantitative simulations Herwig Birg Frankfurt/Main Campus-Verl. 1995 Research reports of the Institute for Population Research and Social Policy (IBS), University of Bielefeld Vol. 21 9783593354323 9783593354323 3593354322 3593354322 ger 498 S.