Ruzicka; van Veen
Justus Liebigs Annalen der Chemie, 1929 , vol. 476, p. 107

Ruzicka; van Melsen
Helvetica Chimica Acta, 1931 , vol. 14, p. 397,405
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Hansen
Chemische Berichte, 1931 , vol. 64, p. 67,69
Journal fuer Praktische Chemie (Leipzig), 1933 , vol. <2> 136, p. 176,185

Ruzicka; Stoll
Helvetica Chimica Acta, 1922 , vol. 5, p. 934

Takagi
Yakugaku Zasshi, 1924 , # 514 p. 1,3
Chem. Zentralbl., 1925 , vol. 96, # I p. 1715

Ruzicka; Stoll
Helvetica Chimica Acta, 1922 , vol. 5, p. 934