Geodesic
Asymptotic behaviour of oscillatory solutions of $n$-th order differential equations with quasiderivatives
Czechoslovak Mathematical Journal, Tome 47 (1997) no. 2, pp. 245-259.

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Sufficient conditions are given under which the sequence of the absolute values of all local extremes of $y^{[i]}$, $i\in \lbrace 0,1,\dots , n-2\rbrace $ of solutions of a differential equation with quasiderivatives $y^{[n]}=f(t,y^{[0]},\dots , y^{[n-1]})$ is increasing and tends to $\infty $. The existence of proper, oscillatory and unbounded solutions is proved.
Classification : 34C10, 34C11 
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     author = {Bartu\v{s}ek, Miroslav},
     title = {Asymptotic behaviour of oscillatory solutions of $n$-th order differential equations with quasiderivatives},
     journal = {Czechoslovak Mathematical Journal},
     pages = {245--259},
     publisher = {mathdoc},
     volume = {47},
     number = {2},
     year = {1997},
     mrnumber = {1452419},
     zbl = {0930.34023},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_1997__47_2_a4/}
}
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Bartušek, Miroslav. Asymptotic behaviour of oscillatory solutions of $n$-th order differential equations with quasiderivatives. Czechoslovak Mathematical Journal, Tome 47 (1997) no. 2, pp. 245-259. http://geodesic.mathdoc.fr/item/CMJ_1997__47_2_a4/