Geodesic
On Bifurcations of Two-Dimensional Diffeomorphisms with a~Homoclinic Tangency of Manifolds of
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Differential equations and dynamical systems, Tome 236 (2002), pp. 95-102.

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Bifurcations of periodic orbits are studied for two-dimensional diffeomorphisms close to a diffeomorphism with the quadratic homoclinic tangency to a saddle fixed point whose Jacobian is equal to one. Problems of the coexistence of periodic orbits of various types of stability are considered. 
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V. S. Gonchenko. On Bifurcations of Two-Dimensional Diffeomorphisms with a~Homoclinic Tangency of Manifolds of. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Differential equations and dynamical systems, Tome 236 (2002), pp. 95-102. http://geodesic.mathdoc.fr/item/TM_2002_236_a10/

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