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- [5] ASYMPTOTIC SOLUTIONS OF LINEAR-DIFFERENTIAL EQUATIONS NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1976, 23 (01): : A121 - A121
- [6] ASYMPTOTIC REPRESENTATION OF THE SOLUTIONS OF A NORMAL-ORDER LINEAR-DIFFERENTIAL EQUATION DOKLADY AKADEMII NAUK SSSR, 1980, 250 (05): : 1050 - 1053
- [8] LIMIT OF SOLUTIONS OF A LINEAR-DIFFERENTIAL EQUATION AMERICAN MATHEMATICAL MONTHLY, 1974, 81 (01): : 92 - 93