Mitryasova, Olena     Environmental natural water quality assessment by method of correlation analysis [Текст] / Olena Mitryasova, Volodymyr Pohrebennyk, Mariush Cygnar, Irina Sopilnyak // 16th International multidisciplinary scientific geoconference SGEM 2016 : conf. proc., 30 June - 6 July, 2016 / Bulg. acad. of sciences, acad. of sciences of the czech rep., Latv. acad. of sciences, Pol. acad. of sciences, Russ. acad. of sciences, Serb. acad. of sciences and arts, Slovak acad. of sciences, Nat. acad. of sciences of Ukraine [et al.]. — Albena, 2016. — P. 317-324.