Graebe; Schultess Justus Liebigs Annalen der Chemie, 1891 , vol. 263, p. 14 Full Text Show Details Ziegler Chemische Berichte, 1890 , vol. 23, p. 2471 Full Text Show Details Weedon; Doughty American Chemical Journal, 1905 , vol. 33, p. 417