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MR 0326063
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MR 0276527 |
Zbl 0256.34005
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MR 0298113
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Higher monotonicity properties of certain Sturm-Liouville functions. Archivum Mathematicum, Brno, (to appear).
MR 0672321
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MR 0463571
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Certain higher monotonicity properties of i-th derivatives of solutions of $y'' + a(t)y' + b(t)y = 0$. Arch. Math. 2, Brno, (1974), 87-102.
MR 0399578