[1] M. H. Freedman and F. S. Quinn:
Topology of 4-Manifolds. Princeton Univ. Press, Princeton, NJ., 1990.
MR 1201584
[2] J. M. Gamboa and C. Ueno:
Proper poynomial maps: the real case. Lectures Notes in Mathematics, 1524. Real Algebraic Geometry. Proceedings, Rennes, 1991, pp. 240–256.
MR 1226257
[3] V. Guillemin and A. Pollack:
Differential Topology. Prentice-Hall, Englewood Cliffs, NJ., 1974.
MR 0348781
[5] J. Margalef and E. Outerelo:
Differential Topology. North Holland, Amsterdam, 1992.
MR 1173211
[6] P. M. G. Manchón: Ph. D. Thesis. (1996), Universidad Complutense de Madrid.
[7] J. Milnor:
Lectures on the $h$-cobordism Theorem. Princeton Univ. Press, Princeton, NJ., 1965.
MR 0190942 |
Zbl 0161.20302
[8] J. Milnor:
A procedure for killing the homotopy groups of differentiable manifolds. Proc. Sympos. Pure Math, Vol. 3 Amer. Math. Soc. Providence, R.I, 1961, pp. 39–55.
MR 0130696