On properties of oscillatory solutions of non-linear differential equations of the n-th order.
(English).In: Vosmanský, Jaromír and Zlámal, Miloš (eds.): Equadiff 6.
Proceedings of the International Conference on Differential Equations and Their Applications held in Brno, Czechoslovakia, Aug. 26 - 30, 1985.
J. E. Purkyně University, Department of Mathematics, Brno, 1986. pp. -113