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Banks, C.J., Davies, J.M., Walker, I. and Ward, R.D. (1976) Biological and physical characterisation of activated sludge: a comparative experimental study of ten different treatment plants. Journal of Water Pollution Control, 75, (4), 492-508.
Banks, C.J., Davies, M., Walker, I. and Ward, R.D. (1976) Biological and hysical characterization of activated sludge: A comparative experimental study at ten treatment plants. Water Pollution Control, 75, (4), 492-508.
Earp, J, Hall, R.D. and McDonald, M. (1976) Modal choice behaviour and the value of travel time: recent empirical evidence. In, Heggie, I.G. (ed.) Modal Choice and the Value of Time. Oxford, GB, Clarendon Press.