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On the location of zeroes of oscillatory solutions of<i>y</i><sup>(<i>n</i>)</sup>=<i>c</i>(<i>x</i>)<i>y</i>
We locate the zeroes of oscillatory solutions of wide classes of differential equations, y (n) = c(x)y.Asymptotic techniques are used.The asymptotic behaviour of solutions and their derivatives up to the nth order are also provided.New results are obtained in addition to old results becoming more transparent.