The notion of *Haefliger structure* is a slight generalization of that of *foliation*. A *Haefliger structure* on a manifold is a cocycle with coefficients in the Haefliger groupoid, a *Haefliger cocycle*.

- Ieke Moerdijk, Janez Mrčun,
*Introduction to foliations and Lie groupoids*, Cambridge Studies in Advanced Mathematics**91**, 2003. x+173 pp. ISBN: 0-521-83197-0

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