Rabinowitz P H.Minimaxmethods in critical point theorywith applications to differential equations[J].CBMS AMS，1986，65:7ˉ18.
[6]
Rabinowitz P H.Some critical point theorems and applications to semilinear elliptic partial differential eatuations[J].Ann Scuola Norm Sup Pisa CI Sci，1978，5:215ˉ223.=================================.4.=================================
[7]
AmbrosettiA，Rabinowitz P H.Dual variationalmethods in a critical points theory and applications[J].J FunctAnal，1973，14:139ˉ381.
[8]
Costa D G，Magalhaes C A.Variational elliptic problemswhich are nonquadrotic at infinity[J].NonlAnalTMA，1994，23:1401ˉ1412.
[9]
Jeanjean L.On the existence of bounded PalaisˉSmale sequences and application to a LandesmanˉLazer type problem set on R N [J].Proc Royal Soc Edinburgh，1999，A129:787ˉ809.
[10]
SchechterM.Superlinear elliptic boundary value problems[J].ManuscriptaMath，1995，86:253ˉ265.
[11]
StuartC A，Zhou H S.A variational problems related to selfˉtrapping of an electromagnetic field[J].MathMethods in Applied Sciences，1996，19:1397ˉ1407.
[12]
StuartC A，Zhou H S.Applying themountain pass theorem to asymptotically linear elliptic equation on R N [J].Commun Partial DefferentialEquations，1999，24:1731ˉ1758.
[13]
Costa D A，Miyagaki O H.Nontrivial solutions for perturbations of the pˉLaplacian on unbounded domains[J].JMath Anal Appl，1995，193:737ˉ755.
[14]
Zhou H S.An application of aMountain Pass Theorem[J].ActaMathematica Sinica:English Series，2002，18:27ˉ36.
