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- [4] SOME OSCILLATION CRITERIA FOR 2ND ORDER LINEAR-DIFFERENTIAL EQUATIONS REVUE ROUMAINE DE MATHEMATIQUES PURES ET APPLIQUEES, 1981, 26 (01): : 135 - 138
- [7] AN IMPROVED WINTNER OSCILLATION CRITERION FOR 2ND ORDER LINEAR-DIFFERENTIAL EQUATIONS CANADIAN MATHEMATICAL BULLETIN-BULLETIN CANADIEN DE MATHEMATIQUES, 1984, 27 (01): : 117 - 121