1. Ewing J, ed. Neoplastic Diseases, A Treatise on Tumors, 3rd ed. W.B. Saunders, Philadelphia: 1928.
2. Sticker A. In: Ewing J,Neoplastic Diseases, A Treatise on Tumors, 3rd ed. W.B. Saunders, Philadelphia. 1928: 1049–1051.
3. Novinsky M. Cent Med Wissensch. 1876; 14: 790.
4. Hanau A. In Ewing J,Neoplastic Diseases, A Treatise on Tumors, 3rd ed. W.E. Saunders, Philadelphia. 1928: 1049–1051.
5. Morau A. Arch Med Exper 1984; 6: 677.