S. F. M. IBRAHIM; Soad Moftah ISMAIL. Study on SIR Epidemic Model with Constant Vaccination: A Differential Transformation Approach. Current Approaches in Science and Technology Research Vol. 12, [S. l.], p. 139–149, 2021. DOI: 10.9734/bpi/castr/v12/10850D. Disponível em: https://stm.bookpi.org/CASTR-V12/article/view/2602. Acesso em: 4 jun. 2026.