Biblio

P. Payment, Sobsey, M. D., Dufour, A. P., Gerba, C. P., and LeChevallier, M. W., “Using a conceptual framework for assessing risks to health from microbes in drinking water”, Journal American Water Works Association, pp. p. 44-48 : 1 fig., photogr., 1993.

P. Payment and Sanchez, W. A., “Water quality control network : proceedings of the meeting held in Ottawa, Canada, 20-24 February 1989”, vol. no. 248e. International Development Research Centre (IDRC), Ottawa, Ont, Canada, p. iv, 28 p.: tab., 1990.