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- [8] REPRESENTATIONS OF SOLUTIONS OF PERIODIC 2ND ORDER LINEAR-DIFFERENTIAL EQUATIONS JOURNAL FUR DIE REINE UND ANGEWANDTE MATHEMATIK, 1983, 344 : 1 - 21
- [10] SOME OSCILLATION CRITERIA FOR 2ND ORDER LINEAR-DIFFERENTIAL EQUATIONS REVUE ROUMAINE DE MATHEMATIQUES PURES ET APPLIQUEES, 1981, 26 (01): : 135 - 138