Yancheva, V., S. Stoyanova, I. Velcheva, S. Petrova, and E. Georgieva. “Metal Bioaccumulation in Common Carp and Rudd from the Topolnitsa Reservoir, Bulgaria”. Archives of Industrial Hygiene and Toxicology, Vol. 65, no. 1, Feb. 2014, doi:10.2478/10004-1254-65-2014-2451.