@article{small,
  title={Analysis of endogenous D-amino acid-containing peptides in metazoa},
  author={Bai, Lu and Sheeley, Sarah and Sweedler, Jonathan V},
  journal={Bioanalytical reviews},
  volume={1},
  pages={7-24},
  year={2009},
  doi={10.1007/s12566-009-0001-2}
}