Crossley; Northey; Hultquist
Journal of the American Chemical Society, 1938 , vol. 60, p. 2217,2219
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Rubzow
Zhurnal Obshchei Khimii, 1940 , vol. 10, p. 831,840
Chem. Zentralbl., 1940 , vol. 111, # II p. 3475