@article{202007.0186, doi = {10.20944/preprints202007.0186.v1}, url = {https://doi.org/10.20944/preprints202007.0186.v1}, year = 2020, month = {July}, publisher = {Preprints}, author = {Abdallah Abusam}, title = {Modeling Epidemics as First-order Systems – COVID-19 Example}, journal = {Preprints} }