中国科学院数学与系统科学研究院期刊网
The Survival Analysis of a Non-autonomous N-dimensional Volterra Mutualistic System in a Polluted Environment
Xiao-jian Li$^{1*}$, Ke Wang$^{2\dagger}$
Acta Mathematicae Applicatae Sinica(English Series) . 2007, (1): 133 -140 .