Stawrowskaja
Zhurnal Obshchei Khimii, 1955 , vol. 25, p. 331,335; engl. Ausg. S. 313, 316
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Burckhalter et al.
Journal of the American Chemical Society, 1948 , vol. 70, p. 1363,1372
Journal of the American Chemical Society, 1950 , vol. 72, p. 1024