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- [47] OSCILLATION THEORY FOR NTH-ORDER LINEAR-DIFFERENTIAL EQUATIONS NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1975, 22 (03): : A411 - A411
- [50] OPERATIONAL CALCULUS FOR GENERAL LINEAR-DIFFERENTIAL OPERATOR OF 2ND ORDER DOKLADI NA BOLGARSKATA AKADEMIYA NA NAUKITE, 1975, 28 (06): : 727 - 730