29. 刘 斌, 具P-Laplacian算子型奇异方程组边值问题正解的存在性, 数 学 学 报1(2005), 35-50.
27. Bing Liu, Controllability of nonlinear neutral evolution integrodifferential systems with infinite delay, J. Optimiz.Theory Appl. , 122:1(2004), 87-109.