M. Aigner and . Fromme, A game of cops and robbers, Discrete Applied Mathematics, vol.8, issue.1, pp.1-12, 1984.
DOI : 10.1016/0166-218X(84)90073-8

S. Balister, B. Binski, B. P. Bollobás, and . Narayanan, Catching a fast robber on the grid, Journal of Combinatorial Theory, Series A, vol.152
DOI : 10.1016/j.jcta.2017.06.009