Al-Mniny, Darine, and Soukaina Zayat. “On Subdivisions of Four Blocks Cycles With Two Non-Consecutive Blocks of Length One in Digraphs With Large Chromatic Number”. The Electronic Journal of Combinatorics 32, no. 3 (July 4, 2025): #P3.4. Accessed May 29, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v32i3p4.