1. Test Methods for Evaluating Solid Waste - Physical/Chemical Methods, Vol. 1B. U.S. Environmental Protection Agency, Washington, DC, 1986.
2. Majors, R. E., “New Devices and Instrumentations for Sample Preparation in Chromatography”, LC.GC 7(2), 92–96, 1989.
3. Beckert, W. F., and Lopez-Avila, V., “Evaluation of SW-846 Method 8060 for Phthalate Esters”, presented at the Fifth Annual Waste Testing and Quality Assurance Symposium, July 24–28, 1989, Washington, DC, USA.
4. Lopez-Avila, V., Schoen, S., Milanes, J., and Beckert, W. F., “Single-Laboratory Evaluation of EPA Method 8080 for Determination of Chlorinated Pesticides and Polychlorinated Biphenyls in Hazardous Wastes”, J. Assoc. Off. Anal. Chem. 71(2), 375–387, 1988.
5. Beckert, W. F., and Lopez-Avila, V., “Evaluation of SW-846 Method 8120 for Chlorinated Hydrocarbons”, Proc. Symp. on Waste Testing and Quality Assurance, July 11–15, 1988, Vol. II, G-102 — G-120.