Citation: Rj. Reina et al., VALIDATED METHOD FOR QUANTITATION AND IDENTIFICATION OF 4,4-DESMETHYLSTEROLS AND TRITERPENE DIOLS IN PLANT OILS BY THIN-LAYER CHROMATOGRAPHY HIGH-RESOLUTION GAS-CHROMATOGRAPHY MASS-SPECTROMETRY, Journal of AOAC International, 80(6), 1997, pp. 1272-1280