Bezerra , J. .; Fernandes , F. H. M. .; Nascimento , R. de S. .; Dias , N. L. .; Bezerra , J. The First Year of the SARS-CoV-2 Pandemic in Maringá-PR : Real-Time Surveillance and Evaluation With a Second Derivative Model. Sigmae 2023, 12, 51-59.