Le caractère oscillatoire des solutions de l'équation $y\sp{(n)}+f(x)y\sp{\alpha }=0,\,n>1$.
(French) [The oscillation character of the solutions of the equation $y\sp{(n)}+f(x)y\sp\alpha=0$, $n>1$].Czechoslovak Mathematical Journal,
vol. 13
(1963),
issue 4,
pp. 481-491