A Survey on Digital Certificates Approaches for the COVID-19 Pandemic

Georgios Karopoulos, Jose L. Hernandez-Ramos, Vasileios Kouliaridis, Georgios Kambourakis
2021 IEEE Access  
doi:10.1109/access.2021.3117781 fatcat:qtz4us35j5dw7dqvvuh7kccifq