no. R3
Topological automata
Revue française d'automatique informatique recherche opérationnelle. Informatique théorique, Tome 8 (1974) no. R3, pp. 73-91. 
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     author = {Ehrig, Hartmut and K\"uhnel, Wolfgang},
     title = {Topological automata},
     journal = {Revue fran\c{c}aise d'automatique informatique recherche op\'erationnelle. Informatique th\'eorique},
     pages = {73--91},
     publisher = {Dunod-Gauthier-Villars},
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     volume = {8},
     number = {R3},
     year = {1974},
     mrnumber = {360739},
     zbl = {0355.94064},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1974__8_3_73_0/}
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Ehrig, Hartmut; Kühnel, Wolfgang. Topological automata. Revue française d'automatique informatique recherche opérationnelle. Informatique théorique, Tome 8 (1974) no. R3, pp. 73-91. http://www.numdam.org/item/ITA_1974__8_3_73_0/

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