Graetz problem for the casson fluid model with prescribed heat flux in a circular ductMuhammad Waris Saeed Khan, Zeeshan Asghar and Abdul HafeezEur. Phys. J. Spec. Top., 233 6 (2024) 1349-1358DOI: https://doi.org/10.1140/epjs/s11734-023-00957-8