Fittig Justus Liebigs Annalen der Chemie, 1867 , vol. 141, p. 134 Full Text Show Details Schmitz Justus Liebigs Annalen der Chemie, 1878 , vol. 193, p. 162,166 Full Text Show Details Fittig; Brueckner Justus Liebigs Annalen der Chemie, 1868 , vol. 147, p. 50