%0 Journal Article %T Existence and uniqueness of solutions for fourth-order periodic boundary value problems under two-parameter nonresonance conditions %A He Yang %A Yue Liang and Pengyu Chen %J Boundary Value Problems %D 2013 %I %R 10.1186/1687-2770-2013-14 %X MSC: 34B15. %K existence %K uniqueness %K two-parameter nonresonance condition %K equivalent norm %U http://www.boundaryvalueproblems.com/content/2013/1/14/abstract