%0 Journal Article
%T On a periodic boundary value problem for second-order linear functional differential equations
%A Mukhigulashvili S
%J Boundary Value Problems
%D 2005
%I Springer
%X Unimprovable efficient sufficient conditions are established for the unique solvability of the periodic problem for , , where , is a linear bounded operator, and .
%U http://www.boundaryvalueproblems.com/content/2005/960698