A SIQRV MATHEMATICAL MODEL ON COVID-19 INVESTIGATING THE COMBINED EFFECT OF VACCINATION AND LOCKDOWN TO CONTROL THE SPREAD OF COVID-19. International Journal of Food and Nutritional Sciences, [S. l.], v. 12, n. 1, p. 2835–2840, 2023. Disponível em: http://ijfans.org/index.php/Journal/article/view/1968. Acesso em: 26 aug. 2026.