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Secondary obstructions to integrability. (English) Zbl 0285.58005

Dynamical Syst., Proc. Sympos. Univ. Bahia, Salvador 1971, 655-661 (1973).

MSC:

58A30 Vector distributions (subbundles of the tangent bundles)
55S30 Massey products
55S35 Obstruction theory in algebraic topology
57R20 Characteristic classes and numbers in differential topology
57R30 Foliations in differential topology; geometric theory