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- [2] MONOTONIC SOLUTIONS TO ORDINARY NON-LINEAR N-TH ORDER DIFFERENTIAL EQUATIONS DOKLADY AKADEMII NAUK SSSR, 1968, 181 (05): : 1054 - &
- [5] OSCILLATION THEOREMS FOR NON-LINEAR ORDINARY DIFFERENTIAL-EQUATIONS OF EVEN ORDER CANADIAN MATHEMATICAL BULLETIN-BULLETIN CANADIEN DE MATHEMATIQUES, 1981, 24 (04): : 409 - 413
- [9] AN OSCILLATION CRITERION FOR NTH ORDER NON-LINEAR DIFFERENTIAL-EQUATIONS WITH FUNCTIONAL ARGUMENTS CANADIAN MATHEMATICAL BULLETIN-BULLETIN CANADIEN DE MATHEMATIQUES, 1983, 26 (01): : 35 - 40