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- [22] EXISTENCE AND UNIQUENESS OF SOLUTIONS OF THE INTERVAL DIFFERENTIAL-EQUATION X'=F(T,X) DOKLADI NA BOLGARSKATA AKADEMIYA NA NAUKITE, 1978, 31 (12): : 1519 - 1522
- [23] PERIODIC-SOLUTIONS OF (A(T)X')'+F(T,X) = P(T) QUARTERLY JOURNAL OF MATHEMATICS, 1976, 27 (105): : 105 - 109
- [24] EXISTENCE OF SOLUTION OF EQUATION X'=F(T,X) IN A BANACH SPACE BULLETIN DE L ACADEMIE POLONAISE DES SCIENCES-SERIE DES SCIENCES MATHEMATIQUES ASTRONOMIQUES ET PHYSIQUES, 1971, 19 (04): : 295 - +