1. Neoplastic Disease;Ewing,1940
2. Penile horn;Taylor;J. Urol.,1944
3. Committee Report: Memoires de l’Academie Royale de Medicine, Juin, 1830.
4. Wilson, E.: Diseases of the Skin, pp. 79, 799. Med. Chir. Transac. 1867.
5. Lebert, H.: Ueber Keratose, Breslau, 1864.