三阶微分方程组边值问题常号解的存在性

孙忠民;赵增勤

The Existence of Constant-Sign Solutions of Bvps for Third OrderDifferential Systems

Sun Zhongmin ;Zhao Zengqin

系统科学与数学 . 2007, (6): 811 -819 . DOI: 10.12341/jssms10021