文献求助,2个叮当,非常感谢
Batista M .epidemic Classical deterministic contagious epidemic models without vital dynamics[j]2020.D01:10.13140/RG.2.2.13709.36322
Batista M .epidemic Classical deterministic contagious epidemic models without vital dynamics[j]2020.D01:10.13140/RG.2.2.13709.36322