Desai
Journal of the Chemical Society, 1931 , p. 1224
Journal of the Chemical Society, 1932 , p. 1065,1074

Okazaki
Yakugaku Zasshi, 1943 , vol. 63, p. 628,634
Chem.Abstr., 1951 , p. 2884
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Godchot; Cauquil; Calas
Bulletin de la Societe Chimique de France, 1939 , vol. <5> 6, p. 1358,1363
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Desai
Journal of the Chemical Society, 1931 , p. 1224
Journal of the Chemical Society, 1932 , p. 1065,1074
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Vogel
Journal of the Chemical Society, 1931 , p. 907,914
Journal of the Chemical Society, 1934 , p. 1758,1762, 1764