Krpo-Ćetković, Jasmina; Subotić, Srđan; Skorić, Stefan; Ćirović, Duško. "Diet of the Eurasian otter (Lutra lutra) on the River Gradac, Serbia: Predation in a brown trout-dominated stream". Aquatic Conservation. 29 (2). 2019: 282–291. doi:10.1002/aqc.3013.