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- [2] MULTIPLE SOLUTIONS FOR NONLINEAR ELLIPTIC BOUNDARY-VALUE PROBLEMS NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1972, 19 (01): : A138 - &
- [8] NONLINEAR ELLIPTIC BOUNDARY-VALUE PROBLEMS AT RESONANCE NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1974, 21 (01): : A151 - A151