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34-40
Kiguradze, Ivan Tarielovich
:
Заметка о колеблемости решений уравнения $u''+a(t) \vert u\vert\sp n \text{sgn}u = 0$
.
(Russian) [A note on the oscillation of solutions of the equation $u''+a(t) \vert u\vert\sp n \text{sgn}u = 0$].
Časopis pro pěstování matematiky
,
vol. 92 (1967), issue 3
,
pp. 343-350
Greguš, Michal
:
Über einige Eigenschaften der Büschel von Lösungen der linearen Differentialgleichungen dritter Ordnung
.
(German) [On some properties of sheefs of solutions of linear differential equation of $3$rd order].
Časopis pro pěstování matematiky
,
vol. 87 (1962), issue 3
,
pp. 311-319
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