The separation and determination of cyclic imino acids.

@article{Irreverre1956TheSA,
  title={The separation and determination of cyclic imino acids.},
  author={F Irreverre and Karl A. Piez and Hendrik L. Wolff},
  journal={The Journal of biological chemistry},
  year={1956},
  volume={223 2},
  pages={687-97}
}