Lombardy, Sylvain, and Jacques Sakarovitch. “Derived Terms Without Derivation a Shifted Perspective on the Derived-Term Automaton”. <i>Journal of Computer Science and Cybernetics</i> 37, no. 3 (September 24, 2021): 201–221. Accessed December 5, 2025. https://vjs.ac.vn/jcc/article/view/16263.