1. Brezhneva, O.A., Tret’yakov, A.A.: Implicit function theorems for nonregular mappings in Banach spaces. Exit from singularity. In: Banach Spaces and their Applications in Analysis, de Gruyter, pp. 285–302 (2007)
2. Brezhneva, O.A., Tret’yakov, A.A., Marsden, J.E.: Higher-order implicit function theorems and degenerate nonlinear boundary-value problems. Commun. Pure Appl. Anal. 7(2), 293–315 (2008)
3. Ioffe, A.D., Tihomirov, V.M.: Theory of Extremal Problems. North-Holland, Amsterdam (1979)
4. Izmailov, A.F., Tret’yakov, A.A.: Factor-Analysis of Nonlinear Mappings. Nauka, Moscow (1994). (in Russian)
5. Izmailov, A.F., Tret’yakov, A.A.: 2-Regular Solutions of Nonlinear Problems. Theory and Numerical Methods. Nauka, Moscow (1999). (in Russian)