Nilsson, Leif. “Changes in Local Distribution and Numbers of Staging and Wintering Bean Geese Anser Fabalis in Scania, South Sweden 1977 1978–2016 2017”. Ornis Svecica, vol. 27, no. 2–4, Oct. 2017, pp. 110–120, doi:10.34080/os.v27.19564.