1
by Welfens, Paul J. J., Audretsch, David B., Addison, John T., Grupp, Hariolf
Published 1998
Springer Berlin Heidelberg

2
by Grupp, Hariolf
Published 1992
Springer Berlin Heidelberg

3
by Gehrke, Birgit, Grupp, Hariolf
Published 1994
Physica-Verlag HD

6
by Cuhls, Kerstin, Blind, Knut, Grupp, Hariolf
Published 2002
Physica-Verlag HD