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13. [The endocrine system and seasonal biological phenomena in birds]. Dol'nik VR. Usp Sovrem Biol; 1971 Oct; 71(3):412-27. PubMed ID: 4938085 [No Abstract] [Full Text] [Related]
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17. The anatomy and physiology of the avian endocrine system. Ritchie M, Pilny AA. Vet Clin North Am Exot Anim Pract; 2008 Jan; 11(1):1-14, v. PubMed ID: 18165134 [Abstract] [Full Text] [Related]