1. Andrews, J. F.: Water Research 6, 319 (1972)
2. Andrews, J. F.: ibid. 6, 575 (1972)
3. Andrews, J. F.: ibid. 8, 261 (1974)
4. Busby, J. B. and Andrews, J. F.: J. WPCF 47, 1055 (1975)
5. Andrews, J. F.: Development of control strategies for waste-water treatment plants, in: Progress in Water Technology (eds. Andrews, J. F., Briggs, R. and Jenkins, S. H.), p. 233, Pergamon Press, Oxford 1974