1. Homotopy resolution of semi-simplicial complexes;Heller;Trans. Amer. Math. Soc.,1955
2. On combinatorial submanifolds of differentiable manifolds;Hirsch;Comment. Math. Helvet.,1961
3. Groups of homotopy spheres I;Kervaire,1963
4. Microbundles and differentiable structures;Milnor,1961