[1] Reiss,E.L.,A.J.Callegari and D.S.Ahluwalia,Ordinary Differential Equations with Applicalions,Holt,Rinehart&Winston,New York(1976). [2] Usmini,R.A.,A uniqueness theorems for a boundary value problem,Proc.Amer.Math.Soc.,77,3(1979),329--335. [3] Aftabizadeh,A.R.,Existence and uniqueness theorems for fourth-order boundary value problems,J.Math.Anal.Appl.,116(1986),415-426. [4] Yang Yi-song,Fourth-order two-point boundary value problems,Proc.Amer.Math.Soc.,104,1(1988),175-180. [5] Gupta,C.P.,Existence and uniqueness theorems for the bending of an elastic beam equation,Applicable Analysis,26(1988),289-305. [6] Gupta,C.P.,Existence and uniqueness results for the bending of an elastic beam equation at resonance,J.Math.Anal.Appl.,135(1988),208-225. [7] Costa,D.G.and J.V.A.Goncalves,Existence and multiplicity results for a class of nonlinear elliptic boundary value problems at resonance,J.Math.Anal.Appl.,84,2(1981),328-337. [8] Browder,F.,Problémes Non-Linéaires,Les Presses de I’Universitéde Montreal,Montreal(1986). [9] Cao Zhi-jiang,Ordinary Differential Operators,Shanghai(1987) (in Chinese) [10] Mawhin,J.,J.R.Ward and M.Willem,Necessary and sufficient conditions of a nonlinear two-point boundary value problems,Proc.Amer.Math.Soc.,93(1985),667-674. [11] Zhang Shi-sheng,Fixed Point Theory and Its Application.Chongqing(1984).(in Chinese) [12] Lin Zong-chi and Lin Su-rong,Singular perturbation on boundary value problem for a vector fourth-order nonlinear differential ēquation,Applied Mathematics and Mechanics(English Ed),9,5(1988),385-396. |