Schaeffer Justus Liebigs Annalen der Chemie, 1869 , vol. 152, p. 289 Full Text Show Details Conrad; Fischer,W. Justus Liebigs Annalen der Chemie, 1893 , vol. 273, p. 107 Full Text Show Details Claus; Oehler Chemische Berichte, 1882 , vol. 15, p. 312 Anm. 2 Full Text Show Details Bender Chemische Berichte, 1889 , vol. 22, p. 996