Generic one-parameter families of vector fields on two-dimensional manifolds . Singularities of vector fields . Plongements dans les variétés feuilletées et classification de feuilletages sans holonomie . Relations de conjugaison et de cobordisme entre certains feuilletages . Expanding attractors . An algebraic construction of the generic singularities of boardman-thom . Manifolds which admit Rn Actions . A classification of the topological types of R2-actions on closed orientable 3 manifolds . La conjecture de weil. I - Sotomayor, Jorge; Takens, Floris; Roussarie, R.; Moussu, R.; Williams, R. F.; Mount, K. R.; Villamayor, O. E.; Chatelet, G.; Rosenberg, H.; Weil, D.; Deligne, Pierre (Publications mathématiques, 1973)