Koolen, Jack, and Brhane Gebremichel. “There Does Not Exist a Strongly Regular Graph With Parameters $(1911,270,105,27)$”. The Electronic Journal of Combinatorics 29, no. 2 (April 1, 2022): P2.3. Accessed April 4, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v29i2p3.