McClelland; D'Silva Journal of the Chemical Society, 1931 , p. 2972,2975 Full Text Show Details v. Auwers; Thies Chemische Berichte, 1920 , vol. 53, p. 2296 Full Text Show Details Friedlaender Justus Liebigs Annalen der Chemie, 1907 , vol. 351, p. 413