1. 1. Afanasieva L. V., Kalinovsky G. I. Morphology of placenta barrier of blood. Veterinary medicine, 2008, no. 6, 35 p. (in Ukrainian)
2. 2. Anderson D. E., Rings M. D. Current Veterinary Therapy: Food Animal Practice, 5th Ed. Saunders, St. Louis MO, 2009, pp. 178–179.
3. 3. Chaykina M. Usual unmaturing of pregnancy: factors of development and feature of therapy. Successes of modern biology, 2008, ed. no. 5 (14), pp. 10–12. (in Russian)
4. 4. Gomela T. L., Cannigam M. D. Neonatology. Moscow, Medicine, 1995, 636 p. (in Russian)
5. Selection of babies for intervention after birth asphyxia