Herwig, P. R., M.J.H. Heule, P. M. van Lambalgen, and H. van Maaren. “A New Method to Construct Lower Bounds for Van Der Waerden Numbers”. The Electronic Journal of Combinatorics 14, no. 1 (January 3, 2007): R6. Accessed March 30, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v14i1r6.