Making research accessible: National Institutes of Health (NIH) public access and PNAS open access policies.

@article{Cozzarelli2005MakingRA,
  title={Making research accessible: National Institutes of Health (NIH) public access and PNAS open access policies.},
  author={Nicholas R. Cozzarelli},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  year={2005},
  volume={102 15},
  pages={5303}
}