1. Andrup, L. et al. (1990), Scand. J. Work. Environ. Health 16,85–95.
2. Kinderlerer, J. (1992), Biotechnology Education 3, 21–25.
3. Bebbington, C.R. and Hentschel, C.C.G. (1985), Trends Biotechnol. 3 314–317.
4. Biintemeyer, H., Bödeker, B.G.D. and Lehmann, J. (1987), in R.E. Spier, J.B. Griffiths (eds.) Modern Approaches to Animal Cell Technology, 8th ESA CT Meeting, Butterworths & Co., Sevenoaks, pp. 411–420.
5. Büntemeyer, H. Lütkemeyer, D. and Lehmann, J. (1991), Cytotechnology 5,57–67.