%0 Journal Article %A Michael F. Atiyah %A Isadore M. Singer %T Index theory for skew-adjoint Fredholm operators %J Publications Mathématiques de l'IHÉS %D 1969 %P 5-26 %V 37 %I Institut des Hautes Études Scientifiques %U https://pmihes.centre-mersenne.org/articles/10.1007/BF02684885/ %R 10.1007/BF02684885 %G en %F PMIHES_1969__37__5_0