SINGH, RAMESH P., and TARKESHWAR LAL. “Reflection Characteristics of EM Waves over Homogeneous Earth Model”. Annals of Geophysics 33, no. 1 (November 25, 1980): 249–259. Accessed December 9, 2021. https://www.annalsofgeophysics.eu/index.php/annals/article/view/4707.