Nilsson, Leif, and Hakon Kampe-Persson. “Changes in Migration and Wintering Patterns of Greylag Geese Anser Anser from Southernmost Sweden During Three Decades”. Ornis Svecica, vol. 28, no. 1, Jan. 2018, pp. 19–38, doi:10.34080/os.v28.19521.