Dr. Klaus D. Joehnk
Institute of Limnophysics
Funenpark 56
1018AK Amsterdam
Netherlands
c/o
Aquatic Microbiology
University of Amsterdam
Nieuwe Achtergracht 127
1018WS Amsterdam
Netherlands
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Tel.: +31 (0) 20 525 7072
mail: Klaus dot Joehnk at limnophysics
dot de
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