@article{Kljavins_1998 author = {M. Kljavins and V. Rodionov and E. Parele and U. Tsinis}, title = {Chemical Composition of Bottom Sediments and the Zoobenthos of the Daugava River}, journal = {Hydrobiological Journal}, issn = {0018-8166}, year = {1998}, volume = {34}, number = {2&3}, pages = {59--65} }