@article{Shcherbak_2011 author = {V. I. Shcherbak and Natalya Ye. Semenyuk}, title = {Use of Phytoperiphyton for the Assessment of the Ecological State of Anthropically Changed Aquatic Ecosystems}, journal = {Hydrobiological Journal}, issn = {0018-8166}, year = {2011}, volume = {47}, number = {4}, pages = {24--40} }