Hanneforth, Thomas, and Kay-Michael Würzner. “Statistical Language Models Within the Algebra of Weighted Rational Languages”. Acta Cybernetica 19, no. 2 (January 1, 2009): 313-356. Accessed March 29, 2024. https://cyber.bibl.u-szeged.hu/index.php/actcybern/article/view/3771.