Parreau, Aline, Michel Rigo, Eric Rowland, and Élise Vandomme. 2015. “A New Approach to the 2-Regularity of the $\ell$-Abelian Complexity of 2-Automatic Sequences”. The Electronic Journal of Combinatorics 22 (1), P1.27. https://doi.org/10.37236/4478.