There exist binary circular 5 / 2 + power free words of every length. Aberkane, Ali; Currie, James D. — 2004 The Electronic Journal of Combinatorics [electronic only]
The number of ternary words avoiding abelian cubes grows exponentially. Aberkane, Ali; Currie, James D.; Rampersad, Narad — 2004 Journal of Integer Sequences [electronic only]