MathSciNet bibliographic data MR1809443 (2001m:37112) 37J10 (37D20 53D35) Arnaud, Marie-Claude Difféomorphismes symplectiques de classe \$C\sp 1\$$C\sp 1$ en dimension 4. (French) [Symplectic \$C\sp 1\$$C\sp 1$-diffeomorphisms of 4-dimensional manifolds] C. R. Acad. Sci. Paris Sér. I Math. 331 (2000), no. 12, 1001–1004. Article

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