TI - An exact analysis of chemical reaction and porosity effects for mixed convective magnetohydrodynamics Casson fluid AU - MOD OMAR, N.F. AU - ISMAIL, Z. AU - JUSOH, R. AU - AHMAD, M.A. AU - MOHAMAD, A.Q. SO - Sigma Journal of Engineering and Natural Sciences 2026;44:262-272. DO - 10.14744/sigma.2025.00060