@article{cooper2001,
  title={The biology of human natural killer-cell subsets},
  author={Megan A. Cooper and Todd A. Fehniger and Michael A. Caligiuri},
  year={2001},
  journal={Trends in Immunology},
  doi={10.1016/s1471-4906(01)02060-9},
  url={https://doi.org/10.1016/s1471-4906(01)02060-9}
}