1. On the ℎ-enclosability of spheres;Antonelli, P. L.;Proc. Cambridge Philos. Soc.,1972
2. The metastable homotopy of 𝑂(𝑛);Barratt, M. G.;Bull. Amer. Math. Soc.,1964
3. Differential structures on a product of spheres;De Sapio, R.;Comment. Math. Helv.,1969
4. Manifolds homeomorphic to sphere bundles over spheres;De Sapio, R.;Bull. Amer. Math. Soc.,1969
5. 5. R. DeSapio, Differentiable structures on a product of spheres. II, Ann. of Math. (to appear).