Pino Romero, N., & López Cruz, R. (2017). Stability Theorems for a Mathematical Model SI with Vital Dynamics Structured by Sex for the Infection Free Steady developed by the Ordinary Differential Equations and the Delay Differential Equations respectively. Selecciones Matemáticas, 4(02), 202-210. https://doi.org/10.17268/sel.mat.2017.02.07