[1]Mo Jiaqi. A class of singularly perturbed reaction diffusion integra l differential system. Acta Math Appl Sinica, 1999, 15: 19-23

[2]Mo Jiaqi. A class of singularly perturbed reaction diffusion systems. App l Math Mech, 1997, 18: 273-277

[3]Mo Jiaqi. Singular perturbation for a class of nonlinear reaction di ffusion systems. Science in China, Ser A, 1989, 32: 1306-1315

[4]Zhang Xiang. Singular perturbation of initial boundary value problem s of reaction diffusion equation with delay. Appl Math Mech, 1994, 15(3):  267-273

[5]E M  de Jager, Jiang Furu. The Theory of Singular Perturbations.Amsterdam: NorthHolland,  1996

[6]Protter M H, Weinberger H F.  Maximum Principles in Differential Equation s. PrenticeHall, 1967