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- [3] OSCILLATION CRITERIA FOR ELLIPTIC EQUATIONS NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1971, 18 (03): : 540 - &
- [5] OSCILLATION CRITERIA FOR ELLIPTIC DIFFERENTIAL EQUATIONS NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1974, 21 (07): : A611 - A611
- [7] EIGENVALUE COMPARISON AND OSCILLATION CRITERIA FOR ELLIPTIC OPERATORS JOURNAL OF THE LONDON MATHEMATICAL SOCIETY-SECOND SERIES, 1971, 3 (APR): : 571 - +