1
by Galler, Heinz, Heilig, Gerhard, Steinmann, Gunter
Published 1994
Physica-Verlag HD
Subjects: '; ...Population Economics...

2
by Buttler, Günter, Heilig, Gerhard, Schmitt-Rink, Gerhard
Published 1992
Physica-Verlag HD
Subjects: '; ...Population Economics...