Geodesic
A Necessary and Sufficient Condition for the Oscillation of an Even Order Nonlinear Delay Differential Equation
Canadian journal of mathematics, Tome 25 (1973) no. 5, pp. 1078-1089

Voir la notice de l'article provenant de la source Cambridge University Press

In this paper we study the oscillatory behavior of the even order nonlinear delay differential equation (1) where (i) denotes the order of differentiation with respect to t. The delay terms τi σi are assumed to be real-valued, continuous, non-negative, non-decreasing and bounded by a common constant M on the half line (t0, + ∞ ) for some t0 ≧ 0. 
Singh, Bhagat. A Necessary and Sufficient Condition for the Oscillation of an Even Order Nonlinear Delay Differential Equation. Canadian journal of mathematics, Tome 25 (1973) no. 5, pp. 1078-1089. doi: 10.4153/CJM-1973-115-0
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