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[期刊论文] 作者：ZhangZhengqiu WangZhicheng,
来源：高校应用数学学报：英文版 年份：2001
The sufficient condition for the existence of non-constant periodic solutions of the following planar system with four delays are obtained:...
[期刊论文] 作者：ZhangZhengqiu WangZhicheng,
来源：高校应用数学学报：英文版 年份：2002
Abstract. The sufficient condition for the existence of 2π-periodic solutions of the following third-order functional differential equations with variable coef...
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