1. Amrén, H.: Ecological studies of zooplankton populations in some ponds on Spitsbergen. Zool. Bidr. Uppsala 36, 161–191 (1964)
2. Andrewartha, H. G., Birch, L. C.: The distribution and abundance of animals. Chicago: University of Chicago Press 1954
3. Protoplasma Monogr.;J. Bělehrádek,1935
4. Benech, V.: Etude expérimentale de l'incubation des oeufs de Baetis rhodani Pictet. Freshwat. Biol. 2, 243–252 (1972)
5. Berrie, A. D.: Productivity of the River Thames at Reading. Symp. zool. Soc. Lond. 29, 69–86 (1972)