@article{ellman1961,
  title={A new and rapid colorimetric determination of acetylcholinesterase activity},
  author={George L. Ellman and K. Diane Courtney and Valentino Andres and Robert M. Featherstone},
  year={1961},
  journal={Biochemical Pharmacology},
  doi={10.1016/0006-2952(61)90145-9},
  url={https://doi.org/10.1016/0006-2952(61)90145-9}
}