[1]
Källander, H. 2004. Age-related distribution of Blackheaded Larus ridibundus and Common Gulls L. canus across the agricultural plains of Skåne, South Sweden, in autumn. Ornis Svecica. 14, 1–2 (Apr. 2004), 48–52. DOI:https://doi.org/10.34080/os.v14.22799.