中国科学院数学与系统科学研究院期刊网
Existence of Positive Periodic Solutions of a Neutral Lotka-Volterra System with Delays
Hai Feng HUO(1),Wan Tong LI(2)
Acta Mathematica Sinica, Chinese Series . 2003, (6): 1199 -121 .  DOI: 10.12386/A2003sxxb0157