Gabriel; Michael Chemische Berichte, 1877 , vol. 10, p. 1557 Chemische Berichte, 1878 , vol. 11, p. 1007 Full Text Show Details Zincke; Gerland Chemische Berichte, 1888 , vol. 21, p. 2392 Chemische Berichte, 1887 , vol. 20, p. 3219