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Weber, Roy E.; Hiebl, Inge; Braunitzer, Gerhard (1988). "High Altitude and Hemoglobin Function in the Vultures Gyps rueppellii and Aegypius monachus". Biological Chemistry Hoppe-Seyler. 369 (4): 233–240. doi:10.1515/bchm3.1988.369.1.233. PMID3401328.
Gavashelishvili, A.; McGrady, M.; Ghasabian, M.; Bildstein, K. L. (2012). "Movements and habitat use by immature Cinereous Vultures (Aegypius monachus) from the Caucasus". Bird Study. iFirst (4): 1–14. doi:10.1080/00063657.2012.728194. S2CID84946546.
Tingay, R. E.; Sureda, N. & Gilbert, M. (2008). "Steppe Eagle (Aquila nipalensis) Foraging Behavior in Mongolia: A Combined Use of Diversionary and Covert Ambush Tactics". Journal of Raptor Research. 42 (2): 155–156. doi:10.3356/JRR-07-52.1. S2CID84630689.
Weber, Roy E.; Hiebl, Inge; Braunitzer, Gerhard (1988). "High Altitude and Hemoglobin Function in the Vultures Gyps rueppellii and Aegypius monachus". Biological Chemistry Hoppe-Seyler. 369 (4): 233–240. doi:10.1515/bchm3.1988.369.1.233. PMID3401328.
Gavashelishvili, A.; McGrady, M.; Ghasabian, M.; Bildstein, K. L. (2012). "Movements and habitat use by immature Cinereous Vultures (Aegypius monachus) from the Caucasus". Bird Study. iFirst (4): 1–14. doi:10.1080/00063657.2012.728194. S2CID84946546.
Tingay, R. E.; Sureda, N. & Gilbert, M. (2008). "Steppe Eagle (Aquila nipalensis) Foraging Behavior in Mongolia: A Combined Use of Diversionary and Covert Ambush Tactics". Journal of Raptor Research. 42 (2): 155–156. doi:10.3356/JRR-07-52.1. S2CID84630689.