Infantile pyknocytosis; a common erythrocyte abnormality of the first trimester.

@article{TUFFY1959InfantilePA,
  title={Infantile pyknocytosis; a common erythrocyte abnormality of the first trimester.},
  author={P TUFFY and Audrey K. Brown and Wolf W Zuelzer},
  journal={A.M.A. journal of diseases of children},
  year={1959},
  volume={98 2},
  pages={227-41}
}