title: A carboxylesterase inhibition assay to estimate parathion, malathion and diazinon in lettuce extracts.
authors.affiliation: Department of National Health and Welfare, Food and Drug Directorate, Ottawa, Canada.
authors.forename: D C
authors.initials: DC
authors.lastname: Villeneuve
authors.forename: A G
authors.initials: AG
authors.lastname: Butterfield
authors.forename: K A
authors.initials: KA
authors.lastname: McCully