Invariance of the Godbillon-Vey class by C^1-diffeomorphisms for higher codimensional foliations
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G. Raby proved in  that the Godbillon-Vey invariant for codimension-one foliations is invariant by C<SUP>1</SUP>-diffeomorphisms. In this paper we generalize the result for foliations of arbitrary codimension.
- Tokyo Sugaku Kaisya Zasshi
Tokyo Sugaku Kaisya Zasshi 51(3), 655-660, 1999-07
The Mathematical Society of Japan