Arrhenius activated energy impacts on irreversibility optimization due to unsteady stagnation point flow of radiative Casson nanofluidsSameh E. Ahmed, Anas A. M. Arafa and Sameh A. HusseinEur. Phys. J. Plus, 137 11 (2022) 1222DOI: https://doi.org/10.1140/epjp/s13360-022-03434-8