Healey; Robinson
Journal of the Chemical Society, 1934 , p. 1625,1628
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Mauthner
Journal fuer Praktische Chemie (Leipzig), 1933 , vol. <2> 136, p. 205,209
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Ballio; Schiavello
Gazzetta Chimica Italiana, 1951 , vol. 81, p. 553,556,557