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Pollak et al.
Monatshefte fuer Chemie, 1930 , vol. 55, p. 358,373
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Corbellini; Albenga
Gazzetta Chimica Italiana, 1931 , vol. 61, p. 111,120
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Macbeth; Price; Winzor
Journal of the Chemical Society, 1935 , p. 325,327