非线性双曲型时滞偏微分方程解的振动性质
刘安平, 郭艳凤, 杨向辉
Oscillations of the Solutions of Nonlinear Delay Hyperbolic Partial Differential Equations
LIU An-ping, GUO Yan-feng, YANG Xiang-hui
数学季刊 . 2004, (4): 373 -378 .