Differential Inclusions, Control and Optimization 24 (2004)
Dimitrios A. Kandilakis
Department of Sciences
Technical University of Crete
Chania, Crete 73100, Greece
Keywords and phrases: variational methods, Palais-Smale condition, saddle point theorem, mountain pass theorem.
2000 Mathematics Subject Classification: 35J20, 35J60.
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Received 7 March 2004