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Klaus Ballarini, Detlef Keese
Physica c1995 Beiträge zur Mittelstandsforschung Bd. 2
Available at 3 libraries
von Klaus Ballarini
J.C.B. Mohr 1982
Available at 7 libraries
Klaus Ballarini, Christian Winterberg
Hain 1975 Mathematical systems in economics 14
Available at 5 libraries