@article{knoth_zdrahal_2012, 
  title={CORE: Three Access Levels to Underpin Open Access}, 
  volume={18}, 
  DOI={10.1045/november2012-knoth}, 
  number={11/12}, 
  publisher={CNRI Acct}, 
  author={Knoth and Zdrahal}, 
  year={2012}
  }