Some problems in accessibility theory
Analyse des systèmes, Astérisque, no. 75-76 (1980), 10 p. 
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Kupka, Ivan. Some problems in accessibility theory, dans Analyse des systèmes, Astérisque, no. 75-76 (1980), 10 p. http://archive.numdam.org/item/AST_1980__75-76__167_0/

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