Bojarinova, Julia, et al. “Autumn Migration of the Long-Tailed Tit (Aegithalos C. Caudatus) at the Opposite Sides of the Eurasian Continent”. Ornis Fennica, vol. 93, no. 4, Dec. 2016, pp. 235–245, https://doi.org/10.51812/of.133904.