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Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry|March 21, 2020
Diffuse Reflectance Spectroscopy; Applications, Standards, and Calibration (With Special Reference to Chromatography)R W FreiJournal of Chromatography|February 21, 1977
Quantitative analysis of nonapeptides in pharmaceutical dosage forms by high-performance liquid chromatographyK Krummen, R W FreiJournal of Chromatography|February 1, 1977
The separation of nonapeptides by reversed-phase high-performance liquid chromatographyK Krummen, R W FreiJournal of Chromatography|September 29, 1976
A low-cost gradient system for high-performance liquid chromatography. Quantitation of complex pharmaceutical raw materialsF Erni, R W FreiJournal of Chromatography|January 11, 1977
A comparison of reversed-phase and partition high-performance liquid chromatography of some digitalis glycosidesF Erni, R W FreiJournal of Chromatography|February 4, 1976
Partition high-pressure liquid-chromatographic systems for the separation of digitalis glycosides of the cardenolide groupW Lindner, R W FreiJournal of Chromatography|September 1, 1979
Identification of ergot alkaloids with a photochemical reaction detector in liquid chromatographyA H Scholten, R W FreiTalanta|January 1, 1973
Preparation and infrared spectra of palladium derivatives of some organophosphorus insecticidesT F Bidleman, R W FreiJournal of Chromatographic Science|June 1, 1975
Quantitative thin-layer chromatography of pesticidesJ D MacNeil, R W FreiJournal of Chromatography|January 21, 1976
Liquid chromatography of dansyl derivatives of some alkaloids and the application to the analysis of pharmaceuticalsR W Frei, W Santi, M ThomasPageof 13