Geodesic
A quasilinear method in the theory of small eigenfunctions for nonlinear periodic boundary-value problems
Contemporary Mathematics. Fundamental Directions, Proceedings of the Fifth International Conference on Differential and Functional-Differential Equations (Moscow, August 17–24, 2008). Part 2, Tome 36 (2010), pp. 72-86.

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Small eigenfunctions of a nonlinear periodic boundary-value problem are studied for the case of double degeneration of the eigenvalue of the linearized problem; the quasilinear representation is used. 
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Ya. M. Dymarskii; D. N. Nepiypa. A quasilinear method in the theory of small eigenfunctions for nonlinear periodic boundary-value problems. Contemporary Mathematics. Fundamental Directions, Proceedings of the Fifth International Conference on Differential and Functional-Differential Equations (Moscow, August 17–24, 2008). Part 2, Tome 36 (2010), pp. 72-86. http://geodesic.mathdoc.fr/item/CMFD_2010_36_a6/

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