@article{Linnik_2013 author = {P.N. Linnik and Ya. S. Ivanechko and R. P. Linnik and V. A. Zhezherya}, title = {Humus Substances of Surface Waters and the Peculiarities of Their Distribution among Various Fractions}, journal = {Hydrobiological Journal}, issn = {0018-8166}, year = {2013}, volume = {49}, number = {5}, pages = {90--111} }