Reference:
  Title: Practical graph isomorphism, II
  Journal: Journal of Symbolic Computation
  Volume: 60
  Number: 0
  Pages: 94 - 112
  Year: 2014
  ISSN: 0747-7171
  DOI: https://doi.org/10.1016/j.jsc.2013.09.003
  URL: https://www.sciencedirect.com/science/article/pii/S0747717113001193
  Author: McKay, B.D. and Piperno, A.
