@misc{indiciae57bd11f750f7,
  title = {Computation times for finite groups, semigroups and automata.},
  author = {Arbib, M. A. and Spira, P. M.},
  year = {1967},
  url = {https://ntrs.nasa.gov/citations/19680033014},
  note = {Source identifier: 19680033014}
}