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Weber, Roy E.; Hiebl, Inge; Braunitzer, Gerhard. High Altitude and Hemoglobin Function in the Vultures Gyps rueppellii and Aegypius monachus. Biological Chemistry Hoppe-Seyler. 1988, 369 (4): 233–240. PMID 3401328. doi:10.1515/bchm3.1988.369.1.233.
Tingay, R. E.; Sureda, N. & Gilbert, M. Steppe Eagle (Aquila nipalensis) Foraging Behavior in Mongolia: A Combined Use of Diversionary and Covert Ambush Tactics. Journal of Raptor Research. 2008, 42 (2): 155–156. S2CID 84630689. doi:10.3356/JRR-07-52.1.