Ba-raadi, A.A, et al. “A Comparative Study of the Productivity and Efficiency of Thermo-Solar Collector Models in Different Climatological Conditions in Some Regions in Yemen”. Thamar University Journal of Natural & Applied Sciences, vol. 2, no. 1, Jan. 2023, pp. 1-11, doi:10.59167/tujnas.v2i2.1276.