Hayward, Ryan B.; Rijswijck, van, Jack (6 de octubre de 2006). «Hex and combinatorics». Discrete Mathematics306 (19–20): 2515-2528. doi:10.1016/j.disc.2006.01.029.
David Gale (1979). «The Game of Hex and Brouwer Fixed-Point Theorem». The American Mathematical Monthly (Mathematical Association of America) 86 (10): 818-827. JSTOR2320146. doi:10.2307/2320146.
Even, S.; Tarjan, R. E. (1976). «A Combinatorial Problem Which is Complete in Polynomial Space». Journal of the ACM23 (4): 710-719. S2CID8845949. doi:10.1145/321978.321989.
Stefan Reisch (1981). «Hex ist PSPACE-vollständig (Hex is PSPACE-complete)». Acta Informatica15 (2): 167-191. S2CID9125259. doi:10.1007/bf00288964.
David Gale (1979). «The Game of Hex and Brouwer Fixed-Point Theorem». The American Mathematical Monthly (Mathematical Association of America) 86 (10): 818-827. JSTOR2320146. doi:10.2307/2320146.
Even, S.; Tarjan, R. E. (1976). «A Combinatorial Problem Which is Complete in Polynomial Space». Journal of the ACM23 (4): 710-719. S2CID8845949. doi:10.1145/321978.321989.
Stefan Reisch (1981). «Hex ist PSPACE-vollständig (Hex is PSPACE-complete)». Acta Informatica15 (2): 167-191. S2CID9125259. doi:10.1007/bf00288964.