Polakowski, M., Jankowiak, L., Stepniewski, K., Stepniewska, K., Kruckenberg, H., Ebbinge, B. S., Broniszewska, M. and Cichocka, A. (2019) “Timing and duration of spring staging of the Eurasian Greater White-fronted Goose (Anser albifrons albifrons) in relation to sex, age and progress of migration season”, Ornis Fennica, 96(1), pp. 24–32. doi: 10.51812/of.133944.