Mankhi, Kawthar Kazem. “Testing The Performance of a Solar Heater Using Convex Lenses As a Means of Concentrating Solar Radiation”. International Journal of Discoveries and Innovations in Applied Sciences, vol. 5, no. 1, Jan. 2025, pp. 8-12, https://oajournals.net/index.php/ijdias/article/view/2694.