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- [5] EXISTENCE-UNIQUENESS THEOREM FOR AN NTH ORDER LINEAR ORDINARY DIFFERENTIAL EQUATION AMERICAN MATHEMATICAL MONTHLY, 1968, 75 (02): : 174 - &
- [9] THEOREM ON THE EXISTENCE AND UNIQUENESS OF THE SOLUTION TO A BOUNDARY VALUE PROBLEM FOR A SYSTEM OF ORDINARY DIFFERENTIAL EQUATIONS DOKLADY AKADEMII NAUK SSSR, 1958, 123 (04): : 613 - 615