Williem M. Minimax Theorems[M]. Boston:Birkhuser,1996.
[2]
Bartolo P, Benci V, Fortunato D. Abstract critical point theorems and applications to some nonlinear problems with strong resonance at infinity[J]. Nonl Anal:TMA,1983,7:981-1012.
Chung N T, Toan H Q. On a class of degenerate and singular elliptic systems in bounded domains[J]. J Math Anal Appl,2009,360(2):422-431.
[8]
Stuart C A, Zhou H S. A variational problem related to self-trapping of an electromagnetic field[J]. Math Methods in the Applied Sciences,1996,19:1397-1407.
[9]
Ramos M. On singular perturbations of superlinear elliptic systems[J]. J Math Anal Appl,2009,352(1):246-258.
[10]
Chen K J. Exact multiplicity results and bifurcation for nonhomogeneous elliptic problems[J]. Nonl Anal TMA,2008,68(11):3246-3265.
[11]
Palais R S. The principle of symmetric criticality[J]. Commun Math Phys,1979,69:19-30.
[12]
Jeanjean L. On the existence of bounded Palais-Smale sequences and application to a Landesman-Lazer type problem set on RN[J]. Proc Roy Soc Edinburgh,1999,A
[13]
9:787-809.
[14]
Zou W M. Variant fountain theorems and their applications[J]. Manusc Math,2001,104:343-358.
[15]
赵俊峰. Banach空间结构理论[M]. 武汉:武汉大学出版社,1991.
[16]
Bartsch T. Infinitely many solutions of a symmetric Dirichlet problem[J]. Nonl Anal:TMA,1993,20:1205-1216.
