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Bogoljubsski
Zhurnal Obshchei Khimii, 1962 , vol. 32, p. 869,870
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Calcott; Tinker; Weinmayr
Journal of the American Chemical Society, 1939 , vol. 61, p. 1010,1014
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Bogoljubsski
Zhurnal Obshchei Khimii, 1962 , vol. 32, p. 869,870
J. Gen. Chem. USSR (Engl. Transl.), 1962 , vol. 32, p. 862,863

Stroh et al.
Angewandte Chemie, 1957 , vol. 69, p. 699,700