“Studies of Rock Bed Solar Thermal Storage System for Space Heating Applications”, Int. J. Emerg. Trends Sci. Technol., vol. 3, no. 11, pp. 4764–4770, Nov. 2016, Accessed: Sep. 28, 2026. [Online]. Available: http://igmpublication.com/ijetst.in/index.php/ijetst/article/view/1351