Shaner, R. L., Kaplan, P., Hamelin, E. I., Bragg, W., & Johnson, R. C. (2014). Comparison of Two Automated Solid Phase Extractions for the Detection of Ten Fentanyl Analogs and Metabolites in Human Urine Using Liquid Chromatography Tandem Mass Spectrometry. J Chromatogr B Analyt Technol Biomed Life Sci.

Shaner, Rebecca L., Pearl Kaplan, Elizabeth I. Hamelin, William Bragg, and Rudolph C. Johnson. "Comparison of Two Automated Solid Phase Extractions for the Detection of Ten Fentanyl Analogs and Metabolites in Human Urine Using Liquid Chromatography Tandem Mass Spectrometry." J Chromatogr B Analyt Technol Biomed Life Sci 2014.

Shaner, Rebecca L., et al. "Comparison of Two Automated Solid Phase Extractions for the Detection of Ten Fentanyl Analogs and Metabolites in Human Urine Using Liquid Chromatography Tandem Mass Spectrometry." J Chromatogr B Analyt Technol Biomed Life Sci 2014.