¬ródło: | W: 16th International Multidisciplinary Scientific GeoConference. SGEM 2016, 30 June - 6 July, 2016, Albena, Bulgaria. Conference proceedings. Book 5, Ecology, economics, education and legislation. Vol. 3, Environmental economics, education and accreditation in geosciences. Sofia : STEF92 Technology, 2016, s. 699-706, bibliogr. 5 poz. |