@article{67731, author = {Susan Tai and Bei Xu and Lorna Sniegoski and Michael Welch}, title = {Development and Evaluation of a Reference Measurement Procedure for the Determination of 19-Norandrosterone in Human Urine Using Isotope-Dilution Liquid Chromatography-Tandem Mass Spectrometry}, year = {2006}, number = {78}, month = {2006-11-01}, publisher = {Analytical Chemistry}, language = {en}, }