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2. Automatic Sequences: Theory, Applications, Generalizations;Allouche,2003
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4. The number of different subwords of given length in the Morse–Hedlund sequence;Avgustinovich;Sib. Zh. Issled. Oper.,1994
5. Enumeration of factors in the Thue–Morse word;Brlek;Discrete Appl. Math.,1989