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- [25] BEHAVIOR OF SOLUTION OF X'(T)=F(T-1,X(T-1))-F(T,X(T) COMPTES RENDUS HEBDOMADAIRES DES SEANCES DE L ACADEMIE DES SCIENCES SERIE A, 1979, 288 (20): : 937 - 939
- [27] EQUATION DELTAU[X(T)+P[X(T)U[X(T]=O IN FUNCTIONAL SPACE DOKLADY AKADEMII NAUK SSSR, 1967, 172 (06): : 1282 - &