Groupoïde d'homotopie d'un feuilletage riemannien et réalisation symplectique de certaines variétés de poisson

The purpose of this paper is to prove the existence of a symplectic realization for a large classe of regular Poisson manifolds with riemannian two dimensional characteristic foliation. To do so, we will show that the homotopy groupoid of a riemannian foliation is locally trivial