Meissner, Włodzimierz, and Dorota Kozakiewicz. “Local Variation in Sex Ratios in Three Species of Wintering Ducks: The Need for Large-Scale Sampling”. Ornis Fennica (September 19, 2025): 00–00. Accessed March 18, 2026. https://ornisfennica.journal.fi/article/view/160744.