Ralph D Whitehead

Quantitation of dialkyl phosphate metabolites of organophosphate pesticides in human urine using GC-MS-MS with isotopic internal standards.

Dana B Barr, D. Barr, L. Needham, 2002, Journal of analytical toxicology.

High-Throughput Sample Preparation for the Quantitation of Acephate, Methamidophos, Omethoate, Dimethoate, Ethylenethiourea, and Propylenethiourea in Human Urine Using 96-Well–Plate Automated Extraction and High-Performance Liquid Chromatography–Tandem Mass Spectrometry

Dana Boyd Barr, D. Barr, L. Needham, 2011, Archives of environmental contamination and toxicology.

Measurement of dialkyl phosphate metabolites of organophosphorus pesticides in human urine using lyophilization with gas chromatography-tandem mass spectrometry and isotope dilution quantification

Asa Bradman, Dana B Barr, D. Barr, 2004, Journal of Exposure Analysis and Environmental Epidemiology.