Prof. Dr. Helmut Schuhmacher i.R.
retired
Faculty of Biology
Aquatic Ecology
Universitätsstrasse 5
D-45141 Essen
Germany
S05V05F48
Tel: +49.201.183.3777
Fax: +49.201.183.2529
helmut.schuhmacher@uni-due.de
retired
Faculty of Biology
Aquatic Ecology
Universitätsstrasse 5
D-45141 Essen
Germany
S05V05F48
Tel: +49.201.183.3777
Fax: +49.201.183.2529
helmut.schuhmacher@uni-due.de