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Elster, H.J. (1954). Über die Populationsdynamik von Eudiaptomus gracilis Sars und Heterocope borealis Fischer im Bodensee-Obersee. [On the population dynamics of Eudiaptomus gracilis Sars and Heterocope borealis Fischer in Lake Constance-Obersee.]. Archiv für Hydrobiologie. suppl. 20(4): 546-614, figs. 1-9, tabs. 1-15, Beilage 1-4.