Lim, H. K.; Andrenyak, D.; et al. (1988-07-15). “Quantification of LSD and N-demethyl-LSD in urine by gas chromatography/resonance electron capture ionization mass spectrometry”. Analytical Chemistry60 (14): 1420–5. doi:10.1021/ac00165a015. PMID3218752.
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Lim, H. K.; Andrenyak, D.; et al. (1988-07-15). “Quantification of LSD and N-demethyl-LSD in urine by gas chromatography/resonance electron capture ionization mass spectrometry”. Analytical Chemistry60 (14): 1420–5. doi:10.1021/ac00165a015. PMID3218752.