@book{knuth1997art,
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  author={Knuth, Donald Ervin},
  volume={3},
  year={1997},
  publisher={Pearson Education}
}

@article{egholm1993pna,
  title={PNA hybridizes to complementary oligonucleotides obeying the Watson--Crick hydrogen-bonding rules},
  author={Egholm, Michael and Buchardt, Ole and Christensen, Leif and Behrens, Carsten and Freier, Susan M and Driver, David A and Berg, Rolf H and Kim, Seog K and Norden, Bengt and Nielsen, Peter E},
  journal={Nature},
  volume={365},
  number={6446},
  pages={566--568},
  year={1993},
  publisher={Springer}
}