Stocka, Izabela, Janina Dziekońska- Rynko, Katarzyna Mierzejewska, Katarzyna Stańczak, and Bogdan Wziątek. 2017. “Occurrence of Nematodes in the Alimentary Tract of Great Cormorants [Phalacrocorax Carbo (Linnaeus, 1758)] in Colonies Located in the Upper and Lower Vistula River”. Oceanological and Hydrobiological Studies 46 (2):168-73. https://czasopisma.bg.ug.edu.pl/index.php/oandhs/article/view/8799.