RT Journal T1 Stability of Age-Structured with Proportion of Infected Groups or Enter the Latent Epidemiological Model with Varying Population Size A1 Gaixia Wang,Jixuan Liu,Xuezhi Li PB Acta mathematica scientia,Series A FD 2019-10-26 YR 2019 JF Acta mathematica scientia, Series A JO Acta mathematica scientia,Series A VO 39 IS 5 SP 1260 DO K1 ;Proportion;Varying population size;Spectrum LK {http://121.43.60.238/sxwlxbA/EN/article/article_15968.shtml}