Oscillation Theorems for Second-order Damped Differential Equations with Distributed Deviating Arguments
SHI Wen-ying,ZHAO Xin-sheng,DAI Xiao-dong
Journal of Hebei University (Natural Science Edition) . 2007, (4): 340 -344 .  DOI: 10.3969/j.issn.1000-1565.2007.04.002