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- [5] CLASSIFICATION OF NO-OSCILLATION CASES FOR EQUATION X+P(T)X++Q(T)X=0 WHERE Q(T) IS OF CONSTANT SIGN DOKLADY AKADEMII NAUK SSSR, 1966, 171 (05): : 1037 - &
- [9] EQUATION DELTAU[X(T)+P[X(T)U[X(T]=O IN FUNCTIONAL SPACE DOKLADY AKADEMII NAUK SSSR, 1967, 172 (06): : 1282 - &