中国科学院数学与系统科学研究院期刊网
Monotone Iterative Technique and Periodic Boundary Value Problem for First Order Impulsive Functional Differential Equations
Zhi Min HE(1), Wei Gao GE(2)
Acta Mathematica Sinica, Chinese Series . 2005, (1): 171 -176 .  DOI: 10.12386/A2005sxxb0019