[1]Il in V A,Moiseev E I.Nonlocal boundory value problem of the first kind for a SturmLiouville operator in its differential and finite difference aspects. Differential Equations,1987,23:803-810

[2]Gupta C P.Solvability of a threepoint nonlinear boundary value problem for a  second order ordinary differential equation.J Math Anal Appl,1992,168 :540-551

[3]Ma R. Existence theorems for a second order three point boundary value problem. J Math Anal Appl, 1997,212:430-442

[4]Gupta C P,Trofimchuk S I.Existence of a solution of a t hreepoint boundary value problem and the spectral radius of a related linear operator. Nonlinear Analysis, 1998,34:489-507

[5]蒋达清．一个奇异非线性三点边值问题．东北师大学报(自然科 学版)，1998，(1)：3-6

[6]Ma R. Positive solutions of a nonlinear threepoint bou ndary value problem. Electron J Diff Eqns, 1999,34:1-8

[7]郭大钧．非线性泛函分析．济南：山东科学技术出版社，1985 

[8]Erbe L H,  Wang Haiyan. On the existence of positive s olutions of ordinary differential equations. Proc Amer Math Soc,1994,120(3):743-748 