1. Amann, R.I., Ludwig, W. & Schleifer, K-H. (1995).Microbiol. Rev. 59: 143–169.
2. Bandi, C., Damiani, G., Magrassi, L., Grigolo, A., Fani, R. & Sacchi, L. (1994).Proc. R. Soc. London B 257: 43–48.
3. Bandi, C., Sironi, M., Damiani, G., Magrassi, L., Nalepa, C.A., Laudani, U. & Sacchi, L. (1995).Proc. R. Soc. London B 259: 293–299.
4. Bijnen, F.G.C., Kestler, P., Hackstein, J.H.P., Harren, F.J.M & Reuss, J. (1995). In: Refined CO-laser photoacoustic trace gas detection; observations of anaerobic processes in insects, soil, and fruit. Thesis of F.G.C. Bijnen, Nijmegen, Chapter 8, pp. 141–172.
5. Bijnen, F.G.C., Harren, F.J.M., Hackstein, J.H.P. & Reuss, J. (1996). Appl. Optics 35/27, 5357–5368.