Clarke D.B., Lloyd A.S., Botting N.P., Oldfield M.F., Needs P.W., Wiseman H. (2002) Measurement of intact sulfate and glucuronide phytoestrogen conjugates in human urine using isotope dilution liquid chromatography-tandem mass spectrometry with [13C(3)]isoflavone internal standards. Anal Biochem 309:158-72

Abbreviation: CLARKE 2002