The impact of vaccination on the evolution of COVID-19 in Portugal
          Beatriz Machado; L. Antunes; Caetano, Constantino P.; João Paulo Freitas Pereira; Baltazar Nunes; Paula Patrício; Morgado, M. Luísa  
          
          Mathematical Biosciences and Engineering , 19 (1) (2022), 936-952  
          http://www.aimspress.com/article/doi/10.3934/mbe.2022043  
           
            
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