[1]
Nilsson, L. 2005. Wintering swans Cygnus spp. and Coot Fulica atra in the Öresund, South Sweden, in relation to available food recources. Ornis Svecica. 15, 1 (Jan. 2005), 13–21. DOI:https://doi.org/10.34080/os.v15.22748.