Update: influenza--United States, 1989-90.

@article{1990UpdateIS,
  title={Update: influenza--United States, 1989-90.},
  author={},
  journal={MMWR. Morbidity and mortality weekly report},
  year={1990},
  volume={39 10},
  pages={157-9}
}
  • Published 1990 in MMWR. Morbidity and mortality weekly report