Hario, M. “Effects of Supplementary Feeding on the C-Egg Constituents in the Nominate Lesser Black-Backed Gull Larus F. Fuscus”. Ornis Fennica 74, no. 4 (December 31, 1997): 167–177. Accessed May 19, 2024. https://ornisfennica.journal.fi/article/view/133471.