%0 Journal Article %A Goldberg, Samuel I. %T Normal Variations of Invariant Hypersurfaces of Framed Manifolds %J Canadian mathematical bulletin %D 1972 %P 513-521 %V 15 %N 4 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1972-090-x/ %R 10.4153/CMB-1972-090-x %F 10_4153_CMB_1972_090_x