Chkhitunidze, M., Khvedelidze, I., & Dzhondzoladze, N. (2014). Assessment of the WKB method error by the Gratton kinematic model for the Earth’s magnetic boundary layer task. Journals of Georgian Geophysical Society, 16, 47–52. Retrieved from https://ggs.openjournals.ge/index.php/GGS/article/view/662