1. Andrews, J. F. (1978), ‘The Development of a Dynamic Model and Control Strategies for the Anaerobic Digestion Process’, In A. James, ed.,Mathematical Models in Water Pollution Control, Chichester: John Wiley & Sons, pp. 281–302.
2. Bader, F. G. (1978), ‘Analysis of double-Limited Growth’,Biotechnology and bioengeneering 20, 183–202.
3. Babier, E. B. (1987), ‘The Concept of Sustainable Economic Development’,Environmental Conservation 14, 101–110.
4. Barbier, E. B. and Markandya, A. (1990), ‘The Conditions for Achieving Environmentally Sustainable Development’,European Economic Review 34, 659–669.
5. Bever, J., Stein, A. and Teichmann, H. (1993)Weitergehende Abwasserreinigung, München, Wien: Oldenbourg Verlag.