Polakowski, M., L. Jankowiak, K. Stepniewski, K. Stepniewska, H. Kruckenberg, B. S. Ebbinge, M. Broniszewska, and A. Cichocka. “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, vol. 96, no. 1, Mar. 2019, pp. 24–32, doi:10.51812/of.133944.