1. https://link.springer.com/chapter/10.1007/978-981-16-2450-6.
2. Fractional order mathematical modeling of COVID-19 transmission;Ahmad;Chaos Solitons Fractals,2020
3. On weighted Atangana-Baleanu fractional operators;Al-Refai;Adv. Differential Equations,2020
4. The role of asymptomatic class, quarantine and isolation in the transmission of COVID-19;Ali;J. Biol. Dyn.,2020
5. Infectious Diseases of Humans: Dynamics and Control;Anderson,1991