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International. 2003 , 11, 389–396. [4] Kortan D, Adamek Z, Polakova S. Winter predation by otter, Lutra lutra on carp pond systems in South Bohemia (Czech Republic). Folia Zool. 2007 , 56, 4, 416–428. [5] English Nature. Retrieved 2010 , 03-15. [6] Conroy J, Chanin P. The status of the Eurasian otter ( Lutra lutra ) in Europe – a review. Proceedings of the first otter toxicology conference, Eds., Conroy, J. W. H., Yoxon, P. and Gutleb, A. C.) 2000 , 7-29. [7] Ruiz-Olmo J, Loy A, Cianfrani C, Yoxon P, Yoxon G, de Silva PK, Roos A., Bisther M, Hajkova P, Zemanova B, 2008

Contamination in Forest and Industrial Regions of Bulgaria, IntechOpen , 2016 . doi:10.5772/64716. [6.] Malinova, D., Investigation on Soil Polution of Different Landscapes on the Territory of Bulgarka Natural Park, Forest Science , 2010 , 2 :75-84. https://naukazagorata.files.wordpress.com/2013/02/article-2-2010-full-text-71.pdf [7.] Djingova, R.; Wagner, G.; Peshev, D., Heavy metal distribution in Bulgaria using Populus nigra ‘Italica’ as a biomonitor, Sci Total Environ , 1995 , 172 :151-158. doi:10.1016/0048-9697(95)04785-9 [8.] Djingova, R.; Wagner, G.; Kuleff