Assay of vitamin B12 in blood. A simple method.

@article{BARAKAT1961AssayOV,
  title={Assay of vitamin B12 in blood. A simple method.},
  author={RUSSEL M. BARAKAT and R P Ekins},
  journal={Lancet},
  year={1961},
  volume={2 7192},
  pages={25-6}
}