Okafor, I. F. “HEAT TRANSFER PERFORMANCE OF A LINEAR FRESNEL SOLAR COLLECTOR ABSORBER TUBES WITH CIRCUMFERENTIAL NON-UNIFORM HEAT FLUX DISTRIBUTIONS”. International Research Journal of Applied Sciences, Engineering and Technology, vol. 8, no. 12, Dec. 2022, pp. 1-9, https://cirdjournals.com/index.php/irjaset/article/view/1027.