Palindromic richness. - Amy Glen; Jacques Justin; Steve Widmer; Luca Q. Zamboni (Eur. J. Comb., 2009)

Permutation complexity of the Thue-Morse word. - Steven Widmer (Adv. Appl. Math., 2011)

Permutation Complexity Related to the Letter Doubling Map - Steven Widmer (WORDS, 2011)

Permutation Complexity and the Letter Doubling Map. - Steven Widmer (Int. J. Found. Comput. Sci., 2012)