1)- Mohamed S Mohamed, Amani Almohaimeed, Mahmoud M Abd El-Raouf. Some new findings on the survival Rényi entropy and application of COVID-19 data.Results in physics. 2021, 31: 104966
2)- Onésime Agossou, Mintodê Nicodème Atchadé, Aliou Moussa Djibril. Modeling the effects of preventive measures and vaccination on the COVID-19 spread in Benin Republic with optimal control.Results in physics. 2021, 31: 104969
3)- Lei Zhang, Saif Ullah, Basem Al Alwan, Ahmed Alshehri, Wojciech Sumelka. Mathematical assessment of constant and time-dependent control measures on the dynamics of the novel coronavirus: An application of optimal control theory.Results in physics. 2021, 31: 104971
5)- Zhong-Hua Shen, Yu-Ming Chu, Muhammad Altaf Khan, Shabbir Muhammad, Omar A Al-Hartomy, M Higazy. Mathematical modeling and optimal control of the COVID-19 dynamics.Results in physics. 2021, 31: 105028
6)- Jamal N Hasoon, Ali Hussein Fadel, Rasha Subhi Hameed, Salama A Mostafa, Bashar Ahmed Khalaf, Mazin Abed Mohammed, Jan Nedoma. COVID-19 anomaly detection and classification method based on supervised machine learning of chest X-ray images.Results in physics. 2021, 31: 105045
7)- Yuanyuan Ma, Yue Cui, Min Wang. A class of delay SIQR-V models considering quarantine and vaccination: Validation based on the COVID-19 perspective.Results in physics. 2021, : 104990