1. An Introduction to Differentiable Manifolds and Riemannian Geometry;Boothby,1975
2. Immersions of manifolds;Hirsch;Trans. Amer. Math. Soc.,1959
3. Piecewise Linear Topology;Hudson,1969
4. On regular neighborhoods;Hudson;Proc. London Math. Soc. (3),1964
5. Embeddings of polyhedral manifolds;Irwin;Ann. of Math.,1965