Lewis; Perkins Industrial and Engineering Chemistry, 1923 , vol. 15, p. 291 Chem. Zentralbl., 1924 , vol. 95, # I p. 2092 Full Text Show Details Green; Price Journal of the Chemical Society, 1921 , vol. 119, p. 448,450 Full Text Show Details Wieland Justus Liebigs Annalen der Chemie, 1923 , vol. 431, p. 33