%0 Journal Article
%T Periodic solutions of fourth-order delay differential equation
%J Bulletin of the Iranian Mathematical Society
%I Iranian Mathematical Society (IMS)
%Z 1017-060X
%A Balamuralitharan, S.
%D 2015
%\ 04/01/2015
%V 41
%N 2
%P 307-314
%! Periodic solutions of fourth-order delay differential equation
%K Fourth-order delay differential equation
%K periodic solutions
%R
%X In this paper the periodic solutions of fourth order delay differential equation of the form $\ddddot{x}(t)+a\dddot{x}(t)+f(\ddot{x}(t-\tau(t)))+g(\dot{x}(t-\tau(t)))+h({x}(t-\tau(t)))=p(t)$ is investigated. Some new positive periodic criteria are given.
%U http://bims.iranjournals.ir/article_610_0669d6cfade607a09955798000b786fb.pdf