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- [23] OSCILLATORY BEHAVIOR SOLUTIONS OF Y'' + P (X) Y = F (X) INDIAN JOURNAL OF PURE & APPLIED MATHEMATICS, 1985, 16 (08): : 853 - 858
- [30] THE ZEROS OF THE SOLUTIONS OF Y(N)+P(X)Y=O EQUATION DOKLADY AKADEMII NAUK SSSR, 1958, 120 (06): : 1180 - 1182