1. Coley, W. B. Practitioner 83, 589–613 (1909).
2. Nauts, H. C. et al. Can. Res. 6, 205–216 (1946).
3. Harmer, T. W. Boston Med. Surg. J. 171, 253 (1914).
4. Johnston, B. J. & Novales, E. T. Can. Chem. Rep. No. 21, 43–68 (1962).
5. Axelrod, R. S. et al. Cancer 61, 2219–2230 (1988).