1. V. A. Bukov, Fiziol. Zhur. SSSR5, 599 (1948).
2. M. E. Marshak, in: Nervous Regulation of Circulation and Respiration [in Russian] (Moscow, 1952) p. 52.
3. M. V. Sergievskii, The Respiratory Center of Mammals [in Russian] (Moscow, 1950) p. 108.
4. E. B. Sologub (Shtyurmer), Fiziol. Zhur. SSSR9, 1064 (1959).
5. W. Blasius, G. Bach, W. Keul, Pflüger's Arch. ges. Physiol.263, 272 (1956).