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2. Multi-residue determinations of pesticides in water;A˚kerblom,1990
3. Har plantevernmidler uheldige virkninger pa˚dyrelivet i ferskvann?;B˦kken;SFFL — seminar nr. 7,1990
4. Organic Pesticides in the Environment;Cohen,1966
5. Report to the 27th Annual Conference of the Water Pollution Control Federation;Cohen,1964