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Pfeiffer; Seydel; Hansen Journal fuer Praktische Chemie (Leipzig), 1929 , vol. <2> 123, p. 349 Full Text Show Details Pfeiffer; Backes Chemische Berichte, 1928 , vol. 61, p. 435 Full Text Show Details Ruzicka; Borges de Almeida; Brack Helvetica Chimica Acta, 1934 , vol. 17, p. 189