1 Zhu X P. Multiple entire solutions of a semilinear elliptic equation. Nonlinear Anal, TMA, 1988, 12(11):1 297-1316
2 Zhu X P. A perturbation result on positive entire solutions of a semilinear elliptic equation. J Diff Eq,1991,92: 163- 178
3 Zhu X P, Zhou H S. Existence of multiple positive solutions of inhomogeneous semilinear elliptic problemsin unbounded domains. Proc Royal Soc Edinburgh, 1990,115:307-318
4 Cao D M, Zhou H S. Multiple positive solutions of nonhomogeneous semilinear elliptic equations in RN.To appear in Proc Royal Soc Edinburgh
5 Tarantello G. On nonhomogeneous elliptic equations involving critical Sobolev exponent. Ann I H P AnalNonlineaire. 1992 ,9: 281-304
6 Tarantello G. Multiplicity results for an inhomogeneous Neumann problem with critical exponent. Manusc-ripta Math, 1993,18: 57-78
7 Cao D M, Noussair E S. Multiplicity of positive and nodal solutions for nonlinear elliptic problem in RN.To appear in Ann J H P Analyse non lineaire
8 Noussair E S, Cao D M. Multiplicity results for an inhomogeneous nonlinear elliptic problem (To appear)
9 Ekeland I. On the variational principle. J Math Anal Appl, 1974,17:324-353
10 Brezis H, Lieb E. A relation between pointwise convergence of functions and convergence of functionals.Pro Amer Math Soc, 1983,8 8: 486-490
11 Cao D M. Multiple solutions for a Neumann problem in an exterior domain. Comm in Partial Diff Eq,1993,1 8:687- 700