Nowakowski, Jaroslaw K., et al. “The Further the Flight, the Longer the Wing: Relationship Between Wing Length and Migratory Distance in Old World Reed and Bush Warblers (Acrocephalidae and Locustellidae)”. Ornis Fennica, vol. 91, no. 3, Sept. 2014, pp. 178–186, https://doi.org/10.51812/of.133854.