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On a periodic boundary value problem for second-order linear functional differential equations
Boundary Value Problems volume 2005, Article number: 960698 (2005)
Unimprovable efficient sufficient conditions are established for the unique solvability of the periodic problem for,, where, is a linear bounded operator, and.
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Mukhigulashvili, S. On a periodic boundary value problem for second-order linear functional differential equations. Bound Value Probl 2005, 960698 (2005). https://doi.org/10.1155/BVP.2005.247