Asatryan, R. S. “MEASURER OF THE ATMOSPHERE`S SPECTRAL TRANSPARENCY ”. Proceedings of the YSU A: Physical and Mathematical Sciences 43, no. 3 (220) (October 4, 2009): 52–54. Accessed July 22, 2024. https://journals.ysu.am/index.php/proceedings-phys-math/article/view/vol43_no3_2009_pp052-054.