Wieland Justus Liebigs Annalen der Chemie, 1903 , vol. 329, p. 262 Full Text Show Details Boeris Gazzetta Chimica Italiana, 1893 , vol. 23 II, p. 173 Full Text Show Details Toennies Chemische Berichte, 1880 , vol. 13, p. 1845 Chemische Berichte, 1887 , vol. 20, p. 2982