Galler HP, Heilig GK, Steinmann G (eds) (1994)
Acta Demographica 1993
Physica-Verlag, Heidelberg, Germany (1994) More
Ott N, Buettner T, Galler HP (1991)
Demographic Changes and Their Implications on Some Aspects of Social Security in the Unified Germany: German Case Study
IIASA Collaborative Paper CP-91-002 (April 1991) More