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2. Dražević, Lj. (2009); ‘‘Pollution by Heavy Metal in the Alluvion of the Ibar River in the Northern Part of Kosovo and Metohija”, PhD thesis (in Serbian);
3. Center for Research and Development “CIR” in Zvecan (in Serbian);
4. RMHK Trepča (2012); ‘‘Industrial Sources of Pollution in the Territory of Leposavic Municipality”, Center for Research and Development, Department of Ecology, Zvečan. (in Serbian);
5. Tušar, B. (2009); ‘‘Wastewater Treatment’’, Kigen, Zagreb (in Croatian);