1. R.G. Smith, R.C. Gallo: Biochem. Pharmac. 25, 491 (1976).
2. F. M. Schabel, Jr.: Cancer Chemother. Rep. Part 1, 59, 261 (1975).
3. R.C. Gallo, R.E. Gallagher, R.G. Smith, D.H. Gillespie, A.M. Wu: Prog. Chemother. 3, 28 (1974) (Antibact. Antivir. AntineopL), Proc. 8th Int. Congr. Chemother., 1973.
4. D.J. Bauer: Br. med. J. 3, 275 (1973).
5. T.H. Maugh II: Science 192, 128 (1976).