%0 Journal Article %T Existence of Solutions to Nonlinear Langevin Equation Involving Two Fractional Orders with Boundary Value Conditions %A Chen Anping %A Chen Yi %J Boundary Value Problems %D 2011 %I Springer %X We study a boundary value problem to Langevin equation involving two fractional orders. The Banach fixed point theorem and Krasnoselskii's fixed point theorem are applied to establish the existence results. %U http://www.boundaryvalueproblems.com/content/2011/516481