Hjort, Christian, Jan Pettersson, Åke Lindström, and J Michael B King. “Fuel Deposition and Potential Flight Ranges of Blackcaps Sylvia Atricapilla and Whitethroats Sylvia Communis on Spring Migration in The Gambia”. Ornis Svecica 6, no. 4 (October 1, 1996): 137–144. Accessed August 11, 2022. https://journals.lub.lu.se/os/article/view/22979.