MathSciDoc: An Archive for Mathematician ∫

@inproceedings{m.1991an,
  title={An algorithm that changes the companion graphs},
  author={M. Azram},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203543434694625},
  booktitle={Arkiv for Matematik},
  volume={32},
  number={2},
  pages={277-291},
  year={1991},
}