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- [2] DISCONJUGACY OF THIRD ORDER DIFFERENTIAL EQUATIONS WITH NONNEGATIVE COEFFICIENTS [J]. NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1971, 18 (05): : 775 - &
- [10] OSCILLATION CRITERIA FOR THIRD-ORDER DIFFERENTIAL EQUATIONS [J]. NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1973, 20 (07): : A665 - A665