Ageing of population in developed countries : causes, consequences, policies : International population conference, Prague, Czechoslovakia, July 4-7,1989 : proceedings. Vol. 4. 1. vyd. Praha : Československá demografická společnost při ČSAV, 1992. s. 403-619. Acta demographica, 9/4. [Copy count : 1, currently available 1, at library only 0]