1. N.D. Zelinskii and G.I. Levi, Izvest. Akad. Nauk SSSR, Otdel. Khim. Nauk, 819 (1951).
2. A.A. Balandin, Zhur. Obshch. Khim.12, 338 (1942); Zhur. Russ. Khim. Obshchest62, 703 (1930).
3. A.A. Balandin and V.V. Patrikeev, Zhur. Obshch. Khim.11, 225 (1941).
4. E. Krczil, Technische adsorptionsstofe in der Kontaktkatalyse (London, 1938).
5. S. Berkman, J. Morrell, and G. Egloff, Catalysis in Inorganic and Organic Chemistry [Russian translation] (Gostoptekhizdat, Moscow-Leningrad, 1949).