The three-squares lemma for partial words with one hole - Blanchet-Sadri, F.; Mercaş, Robert (Theoretical computer science, 2012)
Keywords: Combinatorics on words; Fine and Wilf’s periodicity lemma; Partial words; Squares; Three-squares lemma; Fine and Wilf’s periodicity lemma; Squares; Combinatorics on words; Partial words; Three-squares lemma