↑(en) Hiroyuki Kataoka, Kiyohiko Nakai, Yoshimi Katagiri et Masami Makita, « Analysis of free and bound O-phosphoamino acids in urine by gas chromatography with flame photometric detection », Biomedical Chromatograph, vol. 7, no 4, , p. 184-188 (PMID7693088, DOI10.1002/bmc.1130070403, lire en ligne)