Dobrev, Dobromir, Tsiakiris, Rigas, Skartsi, Theodora, Dobrev, Vladimir, Arkumarev, Volen, Stara, Kalliopi, Stamenov, Anton, Probonas, Nikos, Kominos, Theodoros, Galanaki, Antonia, Kret, Elzbieta, Hallmann, Ben, Grubac, Bratislav, Susic, Goran, Marinković, Saša, Hribsek, Irena, Skorić, Stefan, Jerrentrup, Hans, Lucic, Vedran, Kapelj, Sven, Stoyanov, Georgi, Zakkak, Sylvia, Hristov, Hristo, Stoychev, Stoycho, Sidiropoulos, Lavrentis, Bino, Taulant, Demerdzhiev, Dimitar, "Long-term size and range changes of the Griffon Vulture Gyps fulvus population in the Balkans: a review" in Bird Conservation International (2021),
https://doi.org/10.1017/S0959270921000198 . .