خلوفي س. and شريط ك. 2021. Towards building and activating an early warning system forepidemic risks to confront the expected fourth generation of the Corona virus in Algeria- A necessity after the Coronavirus, Covid-19 (suggested model): تاريخ الاستلام:26/10/ 2020 تاريخ القبول:18/02/2021. Human Resources Development Research. 16, 03 (Nov. 2021), 207–232.