[1]
Bengtsson, K. and Blomquist, L. 2001. Origin, migration, and site fidelity of Black-headed Gulls Larus ridibundus ringed at Malmö. Ornis Svecica. 11, 1–2 (Apr. 2001), 59–77. DOI:https://doi.org/10.34080/os.v11.22860.