Y. A. Muhanna and A. Lyzzaik, Geometric criterion for decomposition and multivalence , Math, Proc. Cambridge Philos. Soc. 103, pp.487-495, 1988.

H. Brieskorn and H. Knörrer, Plane algebraic curves, 1986.

E. M. Chirka, Complex Analytic sets, 1989.

T. De-jong and G. Pfister, Local analytic geometry, Advanced lectures in Mathematics, 2000.

C. Ehresmann, Sur les espaces fibrés différentiables, Compt Rend. Acad. Sci Paris, vol.224, pp.1611-1612, 1947.

D. T. Lê, Un critère d'´ equisingularité. SingularitésSingularitésà Cargèse Astérisque 7-8, pp.183-192, 1973.

H. Lewy, On the non-vanishing of the Jacobian in certain one-to-one mappings, Bulletin of the American Mathematical Society, vol.42, issue.10, pp.689-692, 1936.
DOI : 10.1090/S0002-9904-1936-06397-4

L. Yung-chen, Singularity theory and an introduction to Catastrophe Theory, 1976.

A. Lyzzaik, Local properties of light harmonic mappings, Canad, J. Math, vol.44, issue.1, pp.135-153, 1992.

J. Milnor, Singular points of complex hypersurfaces, Annals of Mathematics studies . Number, vol.61, 1968.

. Sheil-small, Complex polynomials. Cambridge studies in advanced mathematics. 75, 2007.

H. Whitney, On Singularities of Mappings of Euclidean Spaces. I. Mappings of the Plane into the Plane, The Annals of Mathematics, vol.62, issue.3, pp.374-410, 1955.
DOI : 10.2307/1970070