The electrotopological state: structure information at the atomic level for molecular graphs

@article{Hall1991TheES,
  title={The electrotopological state: structure information at the atomic level for molecular graphs},
  author={Lowell H. Hall and Brian Mohney and Lemont B. Kier},
  journal={Journal of Chemical Information and Computer Sciences},
  year={1991},
  volume={31},
  pages={76-82}
}