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- [2] STABILITY OF EQUATION X(T)+P(T)X(T)+Q(T)X(T)=0 SCIENTIA SINICA SERIES A-MATHEMATICAL PHYSICAL ASTRONOMICAL & TECHNICAL SCIENCES, 1986, 29 (04): : 363 - 374
- [6] 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 - &