<commit_before>Model coming from Arino paper

```Smalltalk
KModel SEIRS
    attribute: #(status -> S E I R);
    parameters: #(beta lambda gamma mu sigma nu);
    lambda: #(beta*I/N);
    equations: #(
         S:t=mu*N - beta*S*I/N - mu*S + nu*R.
         E:t=beta*S*I/N - sigma*E - mu*E.<commit_msg>Update m1.md<commit_after>Model describe in paper: https://academic.oup.com/imammb/article-abstract/22/2/129/770960

```Smalltalk
KModel SEIRS
    attribute: #(status -> S E I R);
    parameters: #(beta lambda gamma mu sigma nu);
    lambda: #(beta*I/N);
    equations: #(
         S:t=mu*N - beta*S*I/N - mu*S + nu*R.
         E:t=beta*S*I/N - sigma*E - mu*E.
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