Milberg, P., L. Gezelius, I. Blindow, L. Nilsson, and T. Tyrberg. 2002. “Submerged Vegetation and the Variation in the Autumn Waterfowl Community at Lake Tåkern, Southern Sweden”. Ornis Fennica 79 (2):72–81. https://ornisfennica.journal.fi/article/view/133573.