1. Vagelos, P.R. (1991) Are prescription drug prices too high.Science 252: 1080–1084.
2. de Maris (1993)Review of the Pharmaceutical Industry: Costs. Document No. OTA-H-523 (February 1993), U.S. Government Publication.
3. Lee, K.B. and Burrill, G.S. (1994)Biotech 95: Reform, Restructure, Renewal, The Ernst and Young Ninth Annual Report on the Biotechnology Industry, p14.
4. Joint ESACT-IABS meeting on the use of heteroploid and other cell substrates for the production of biologicals. (1982)Developments in Biological Standardization vol 50, Karger, Basel, Switzerland.
5. Continuous cell lines as substrates for biologicals. (1989)Developments in Biological standardization vol 70, Karger, Basel, Switzerland.