no. 3
Some further remarks on the family of finite index matrix languages
RAIRO. Informatique théorique, Tome 13 (1979) no. 3, pp. 289-297. 
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     volume = {13},
     number = {3},
     year = {1979},
     mrnumber = {554688},
     zbl = {0422.68036},
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     url = {http://archive.numdam.org/item/ITA_1979__13_3_289_0/}
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PĂun, Gheorghe. Some further remarks on the family of finite index matrix languages. RAIRO. Informatique théorique, Tome 13 (1979) no. 3, pp. 289-297. http://archive.numdam.org/item/ITA_1979__13_3_289_0/

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