@misc{1195441,
  author = {L Chen},
  title = {Recommendation for key derivation through extraction-then-expansion:},
  year = {2011},
  month = {2011-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NIST.SP.800-56c},
  language = {en},
}