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2. M. Allsopp, 1994 . Achieving zero dioxin. Greenpeace, London, September.
3. R. P. M. Berbee, 1987 .Onvenvachte aanwezigheidvan organische chloor-en broomverbindingen in het a/valuiater wan 6 chemische bedrijwen [Unexpected presence of organic chlorine compounds in the effluent from 6 chemical companies]. RIZA, Lelystad, Holland (not public).