no. 2
On context constrained squares and repetitions in a string
RAIRO. Informatique théorique, Tome 18 (1984) no. 2, pp. 147-159. 
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     volume = {18},
     number = {2},
     year = {1984},
     mrnumber = {761514},
     zbl = {0543.68067},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1984__18_2_147_0/}
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Apostolico, A. On context constrained squares and repetitions in a string. RAIRO. Informatique théorique, Tome 18 (1984) no. 2, pp. 147-159. http://www.numdam.org/item/ITA_1984__18_2_147_0/

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