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- [6] ELEMENTARY UNIQUENESS THEOREMS FOR DIFFERENTIAL EQUATIONS AMERICAN MATHEMATICAL MONTHLY, 1961, 68 (03): : 275 - &
- [7] UNIQUENESS THEOREMS FOR ORDINARY DIFFERENTIAL EQUATIONS AMERICAN MATHEMATICAL MONTHLY, 1962, 69 (05): : 421 - &
- [8] UNIQUENESS THEOREMS FOR ORDINARY DIFFERENTIAL EQUATIONS DOKLADY AKADEMII NAUK SSSR, 1958, 120 (04): : 704 - 707