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Galler, H.P., Heilig, G.K. & Steinmann, G. (1994). Acta Demographica 1993. Heidelberg: Physica-Verlag. ISBN 978-3-642-47687-7

Ott, N., Büttner, T. & Galler, H.P. (1991). Demographic Changes and Their Implications on Some Aspects of Social Security in the Unified Germany: German Case Study. IIASA Collaborative Paper. IIASA, Laxenburg, Austria: CP-91-002