共 24 条
[1]
Agarwa R.P., 2005, Aequ. Math, V69, P83, DOI [10.1007/s00010-004-2735-9, DOI 10.1007/S00010-004-2735-9]
[2]
[Anonymous], 1995, World Sci. Ser. Nonlinear Sci., Ser. A., DOI DOI 10.1142/2892
[3]
[CAI Guolan 蔡果兰], 2006, [数学研究与评论, Journal of Mathematical Research and Exposition], V26, P725
[8]
Lakshmikantham V., 1989, World scientific, V6