Plasma-zinc and copper in pregnancy and after oral contraceptives.

@article{Halsted1968PlasmazincAC,
  title={Plasma-zinc and copper in pregnancy and after oral contraceptives.},
  author={J A Halsted and B M Hackley and James Cecil Smith},
  journal={Lancet},
  year={1968},
  volume={2 7562},
  pages={278-9}
}