Source apportionment of nitrogen in Estonian riversKaur, Katrin; Vassiljev, Anatoli; Annus, Ivar; Stalnacke, PerJournal of water supply : research and technology - AQUA2017 / p. 469-480 https://doi.org/10.2166/aqua.2017.036

Use of nonlinear regression for estimating emission of nitrogen to Estonian riversVassiljev, Anatoli; Annus, Ivar; Kaur, Katrin; Kändler, NilsEcology & safety2017 / p. 33-40 : ill https://www.scientific-publications.net/en/article/1001351/