1. E. Ullman, 1902. (no title), Wien. med. Wschr. 52:526.
2. E. Ullman, 1902. (no title), Wien. med. Wschr. 52:573.
3. E. Ullman, 1902. (no title), Wien. med. Wschr., 52:1320.
4. H. Schott, and E. Seidler (eds.), 1993. Chronik der Medizin [Chronicle of Medicine]. Dortmund: Harenberg, p. 490.
5. F. D. Moore, 1972. Transplant: The Give and Take of Tissue Transplantation. New York: Simon & Schuster, pp. 40–41.