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References:
[1] G. D. Jones e S. M. Rankin: Oscillation of a forced nonlinear second order differential equation, III. Lincei-Rend. Sc. fis. mat. e nat. - Vol. LIX - dicembre 1975.
[2] W. A. Coppel: Disconjugary. Springer Verlag Berlin-Heidel New York 1971. MR 0460785
[3] A. J. Levin: Neoscillacija rešenij uravnenja $x^{(n)} + p_1 (t) x^{(n-1)}+ ... + p_n (t)x = 0$. Uspechi matematičeskich nauk, tom XXIV, vypusk 2 (146), 1969.
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