Abelian periods, partial words, and an extension of a theorem of Fine and Wilf Francine Blanchet-Sadri, Sean Simmons, Amelia Tebbe and Amy Veprauskas RAIRO-Theor. Inf. Appl., 47 3 (2013) 215-234 Published online: 25 April 2013 DOI: 10.1051/ita/2013034