Rystsov, I. K. “Quasioptimal Bound for the Length of Reset Words for Regular Automata”. Acta Cybernetica 12, no. 2 (January 1, 1995): 145-152. Accessed December 1, 2024. https://cyber.bibl.u-szeged.hu/index.php/actcybern/article/view/3453.