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Non-trivialite des classes caractéristiques de g-structures. Application aux classes caractéristiques de feuilletages. (French) Zbl 0348.57006

##### MSC:
 57R20 Characteristic classes and numbers in differential topology 53C10 $$G$$-structures 55R40 Homology of classifying spaces and characteristic classes in algebraic topology 57R30 Foliations in differential topology; geometric theory