. . . "Demographic challenges for the 21st century : a state of the art in demography : conference organized as a tribute to the continuing endeavours of Ron Lesthaege in the field of demography" . . "Livres électroniques" . . . "Congressen (vorm)" . . . . . . "Demographic challenges for the 21st century : a state of the art in demography ; conference organized as a tribute to the continuing endeavours of Prof. Dr. Em. Ron Lesthaeghe in the field of demography ; [liber amicorum Ron Lesthaeghe]" . . . "Conference papers and proceedings"@en . "Conference papers and proceedings" . "Demographic challenges for the 21st century : a state of the art in demography : conference organized as a tribute to the continuing endeavours of Prof. Dr. Em. Ron Lesthaege in the field of demography" . "Conference proceedings" . . . . . . "Demographic challenges for the 21st century a state of the art in demography : conference organized as a tribute to the continuing endeavours of Prof. Dr. Em. Ron Lesthaeghe in the field of demography" . . . . . "Demographic challenges for the 21st century : a state of the art in demography" . . . . . . . "Demographic challenges for the 21st century : a state of the art in demography : conference organized as a tribute to the continuing endeavours of Prof. Dr. Em. Ron Lesthaeghe in the field of demography" . "Demographic challenges for the 21st century : a state of the art in demography : conference organized as a tribute to the continuing endeavours of Prof. Dr. Em. Ron Lesthaeghe in the field of demography"@en . . . . . . "Electronic books"@en . "Colloquium Demographic Challenges for the 21st Century (2007.02.15-16 Etterbeek, Brussels)" . . . "Démographie Congrès et conférences." . . "Demographie." . . "Demography Congresses." . . "Demografie." . . "Europa." . . "Demografia Congressos." . . "Demografia - Sec.21. - Saggi." . . . . "Bevölkerungsentwicklung." . . "Electronic books." . . "Electronic books" . "Demography." . . "Demography" .