Some remarks on multihead automata
RAIRO. Informatique théorique, Tome 11 (1977) no. 3, pp. 181-195. 
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     author = {Sudborough, I. H.},
     title = {Some remarks on multihead automata},
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     pages = {181--195},
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     address = {Montreuil},
     volume = {11},
     number = {3},
     year = {1977},
     mrnumber = {474983},
     zbl = {0369.68035},
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     url = {http://www.numdam.org/item/ITA_1977__11_3_181_0/}
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Sudborough, I. H. Some remarks on multihead automata. RAIRO. Informatique théorique, Tome 11 (1977) no. 3, pp. 181-195. http://www.numdam.org/item/ITA_1977__11_3_181_0/

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