¬ródło: | W: 18th International Multidisciplinary Scientific GeoConference. SGEM 2018, 2 July - 8 July 2018, Albena, Bulgaria. Conference proceedings. Vol. 18, Ecology, economics, education and legislation. Iss. 5.2, Ecology and environmental protection. Sofia : STEF92 Technology, 2018, s. 811-818, bibliogr. 10 poz. |