Bonnet, Édouard; Jamain, Florian; Saffidine, Abdallah (14 August 2013). Havannah and TwixT are PSPACE-complete. The 8th Intl. Conf. on Computers and Games. Keio University, Yokohama, Japan. arXiv:1403.6518. doi:10.1007/978-3-319-09165-5_15.
Bonnet, Édouard; Jamain, Florian; Saffidine, Abdallah (14 August 2013). Havannah and TwixT are PSPACE-complete. The 8th Intl. Conf. on Computers and Games. Keio University, Yokohama, Japan. arXiv:1403.6518. doi:10.1007/978-3-319-09165-5_15.