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Nectar production of Epilobium angustifolium L. at different air humidities; nectar sugar in individual flowers and the optimal foraging theory |
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| Authors: | Andreas Bertsch |
| Affiliation: | 1. Fachbereich Biologie der Philipps Universit?t, Karl von Frisch Stra?e, D-3550, Marburg, Federal Republic of Germany |
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