In this paper, a class of third-order quasi-linear differential equations withcontinuously distributed delay is studied. Applying the generalized Riccatitransformation, integral averaging technique of Philos type and Young’sinequality, a set of new criteria for oscillation or certain asymptoticbehavior of nonoscillatory solutions of this equations is given. Our resultsessentially improve and complement some earlier publications.
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Qin et al. (2013) studied this question.