Seyda Chemische Berichte, 1883 , vol. 16, p. 690 Full Text Show Details Kauffmann Chemische Berichte, 1907 , vol. 40, p. 840 Full Text Show Details Hantzsch Chemische Berichte, 1907 , vol. 40, p. 3536 Chemische Berichte, 1908 , vol. 41, p. 1214