Small sub-Riemannian balls onR 3

El-H. Ch. El-Alaoui1, Jean-Paul Gauthier2, Ivan Kupka3
1INSA de Rouen, Department of Mathematics, LMI, URA CNRS D 1378, Mont Saint Aignan cedex, France
2Laboratoire de Mathématiques, AMS-LMI, URA CNRS 1378, INSA de Rouen, Mont-Saint-Aignan Cedex, France
3Department of Mathematics, University of Paris VI, Paris cedes 05, France

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