- Determination of 2,3,7,8-chlorine-substituted dibenzo-p-dioxins and -furans at the part per trillion level in United States beef fat using high-resolution gas chromatography/high-resolution mass spectrometry. Ferrario, J., Byrne, C., McDaniel, D., Dupuy, A., Harless, R. Anal. Chem. (1996)