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- [34] BOUNDS FOR EIGENVALUES OF ELLIPTIC OPERATORS NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1976, 23 (07): : A679 - A679
- [37] BOUNDING EIGENVALUES OF ELLIPTIC OPERATORS NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1976, 23 (01): : A127 - A127
- [39] EIGENFUNCTIONS AND EIGENVALUES OF SQUEEZE OPERATORS PHYSICAL REVIEW A, 1990, 42 (11): : 6752 - 6755