Matricial construction of k-colourings on square lattice

@article{Marn2005MatricialCO,
  title={Matricial construction of k-colourings on square lattice},
  author={Juan Manuel Mar{\'i}n and Alberto M{\'a}rquez and Maria Pastora Revuelta Marchena},
  journal={Ars Comb.},
  year={2005},
  volume={77}
}