J. Z. G. Ma. “Effects of Non Isothermality and Wind-Shears on the Propagation of Gravity Waves (II): Ray-Tracing Images”. Global Journal of Science Frontier Research 16, no. F3 (March 15, 2016): 37–81. Accessed April 27, 2024. https://journalofscience.org/index.php/GJSFR/article/view/1785.