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References:
[1] J. Ohriska: Oscillation of differential equations and $v$-derivatives. Czech. Math. J., 39 (114) (1989),24-44. MR 0983481 | Zbl 0673.34044
[2] W. T. Reid: Sturmian theory of ordinary differential equations. Springer-Verlag New York Inc., 1980. MR 0606199
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