Mauthner
Journal fuer Praktische Chemie (Leipzig), 1931 , vol. <2> 129, p. 278
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Frank; Fanta; Tarbell
Journal of the American Chemical Society, 1948 , vol. 70, p. 2314,2317

Spaeth
Monatshefte fuer Chemie, 1919 , vol. 40, p. 138
Monatshefte fuer Chemie, 1921 , vol. 42, p. 263

Sharp
Journal of the Chemical Society, 1936 , p. 1234
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Frank; Fanta; Tarbell
Journal of the American Chemical Society, 1948 , vol. 70, p. 2314,2317