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T. S. Ratiu, Switzerland e-mail: tudor.ratiu@epfl.ch Vyacheslav N. Samokhin Moscow State University of Printing Art 2A Pryanishnikova ul, Shanghai China Tudor S. Ratiu Section de Mathématiques Mathématiques´MathématiquesÉcole Polytechnique Fédérale de Lausanne 1015 Lausanne, 2016.