Thomas, Emery Secondary obstructions to integrability. (English) Zbl 0285.58005 Dynamical Syst., Proc. Sympos. Univ. Bahia, Salvador 1971, 655-661 (1973). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 1 Document 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 PDFBibTeX XML