1. Arch. d. Pharm. 238, 505. — Karl Greiner, AePP. 40, 287.
2. J. M. Fuchelmann, Diss. Rostock (1911).
3. A. Schildlowski, Diss. Petersburg (1907).
4. Pierzcyek, Arch. d. Pharm. 1890, 352.-Ehrenthal, Arch. d. Pharm. 1890, 357.
5. Kiliani, Arch. d. Pharm. 34, 438. - Karl Hedbom, AePP. 45, 342 (1901).