@article{80146,
  author = {Bryant Nelson and Christine Pfeiffer and S Margolis and C Nelson},
  title = {Affinity Extraction Combined with Stable Isotope Dilution LC/MS for the Determination of 5-Methyltetrahydrofolate in Human Plasma},
  year = {2003},
  number = {313},
  month = {2003-02-01},
  publisher = {Analytical Biochemistry},
  language = {en},
}