Clemo; Ramage
Journal of the Chemical Society, 1931 , p. 49,54
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Blicke; Blake
Journal of the American Chemical Society, 1931 , vol. 53, p. 1015,1021
Pfeiffer; Seydel; Hansen
Journal fuer Praktische Chemie (Leipzig), 1929 , vol. <2> 123, p. 349
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Pfeiffer; Backes
Chemische Berichte, 1928 , vol. 61, p. 435
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Ruzicka; Borges de Almeida; Brack
Helvetica Chimica Acta, 1934 , vol. 17, p. 189