1. Ein Naevus papillaris pigmentosus der pars prostatica der Urethra mit sarko-karzinomatosen Metastasen;Albrecht;Vernandl. d. deutsch. path. Gesellsch.,1910
2. Fibro-sarcoma of the male urethra;Bailey;J. Urol.,1934
3. Neoplastic Diseases;Ewing,1928
4. Generalized multiple pigmented sarcoma originating in the skin;Frick;Jour. Am. Med. Assoc.,1906
5. A case of urethral myxosarcoma;Graeve;Acta Chir. Scandi.,1933