Kim , H.-K., C.-Y. Choi, M.-S. Jeong, H.-Y. Kang, and W.-S. Lee. “Regurgitation of the Koilin Layer in Chinstrap Penguins (<em>Pygoscelis antarcticus</Em&gt;) and Its Association With Gastric Parasites”. Polar Research, vol. 35, June 2016, doi:10.3402/polar.v35.25966.