Kushnir, Andrew Y, Tiffany Ng, David Kilroy, and Hanne Jahns. “Duplication Cysts in the Oesophagus and Pylorus of a Juvenile Grey Seal (Halichoerus grypus): A Case Report”. Biology, Engineering, Medicine and Science Reports 5, no. 1 (July 1, 2019): 10–12. Accessed November 24, 2024. https://bemsreports.org/index.php/bems/article/view/38.