rticles/inst/rmarkdown/templates/pnas_article/skeleton/pnas-sample.bib

@inproceedings{belkin2002using,
  title={Using manifold stucture for partially labeled classification},
  author={Belkin, Mikhail and Niyogi, Partha},
  booktitle={Advances in neural information processing systems},
  pages={929--936},
  year={2002}
}

@article{berard1994embedding,
  title={Embedding Riemannian manifolds by their heat kernel},
  author={B{\'e}rard, Pierre and Besson, G{\'e}rard and Gallot, Sylvain},
  journal={Geometric \& Functional Analysis GAFA},
  volume={4},
  number={4},
  pages={373--398},
  year={1994},
  publisher={Springer}
}

@article{coifman2005geometric,
  title={Geometric diffusions as a tool for harmonic analysis and structure definition of data: Diffusion maps},
  author={Coifman, Ronald R and Lafon, Stephane and Lee, Ann B and Maggioni, Mauro and Nadler, Boaz and Warner, Frederick and Zucker, Steven W},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  volume={102},
  number={21},
  pages={7426--7431},
  year={2005},
  publisher={National Acad Sciences}
}