Honglei Xu, Tingting Gu, Juan Zheng, and Kai Li. 2021. “LF Sky Wave Propagation Excited by a Horizontal Electric Dipole Towards Understanding of Its Radiation Mechanism”. Applied Computational Electromagnetics Society Journal (ACES) 33 (06):657-64. https://journals.riverpublishers.com/index.php/ACES/article/view/9125.