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[1] GYORI I.-LADAS G.: Oscillation Theory of Delay Differential Equations with Applications. Clarendon Press, Oxford, 1991. MR 1168471
[2] KUSANO T.-NAITO M.: Non linear oscillation of fourth order differential equations. Canad. J. Math. 4 (1976), 840-852. MR 0430415
[3] PARHI N.-RATH R. N.: On oscillation of solutions of forced non linear neutral differential equations of higher order. Czechoslovak Math. J. (To appear). MR 2018832
[4] PARHI N.-RATH R. N.: On oscillation criteria for forced nonlinear higher order neutral differential equations. (Communicated). Zbl 1099.34060
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