Karlsson, L., S. Ehnbom, K. Persson, and G. Walinder. “Changes in Numbers of Migrating Birds at Falsterbo, South Sweden, During 1980—1999, As Reflected by Ringing Totals”. Ornis Svecica, vol. 12, no. 3, July 2002, pp. 113-37, doi:10.34080/os.v12.22825.