Heller Chemische Berichte, 1916 , vol. 49, p. 2769 Full Text Show Details v. Auwers; Huettenes Chemische Berichte, 1922 , vol. 55, p. 1135 Full Text Show Details Heller Chemische Berichte, 1922 , vol. 55, p. 2690 Chemische Berichte, 1926 , vol. 59, p. 708