"Proceedings of a workshop held in Brussels, Belgium, 26-27 October 1988, under the auspices of COST (European Cooperation in Scientific and Technological Research)--COST 641 and 681, organized jointly by the Commission of the European Communities, Brussels, Belgium, the Study Centre for Water Research (S.V.W.), Antwerp, Belgium and the Institute for Hygiene and Epidemiology (I.H.E.), Brussels, Belgium."
