1. The stable homotopy of the classical groups;Bott, Raoul;Proc. Nat. Acad. Sci. U.S.A.,1957
2. On the immersion of manifolds in euclidean space;Lashof, R.;Ann. of Math. (2),1958
3. On the cohomology ring of a sphere bundle;Massey, W. S.;J. Math. Mech.,1958
4. On the immersion of 𝑛-manifolds in (𝑛+1)-space;Milnor, John;Comment. Math. Helv.,1956
5. \bysame, On the relationship between differentiable and combinatorial manifolds, Princeton University, 1956, Mimeographed.