具连续分布变元的向量抛物型方程振动性的新准则
李元旦, 罗李平, 俞元洪
New Criteria for Oscillation of Vector Parabolic Equations with Continuous Distribution Arguments 
LI Yuan-dan, LUO Li-ping, YU Yuan-hong
数学季刊 . 2011, (2): 260 -264 .