Li, Haiying, Zhensen Wu, Zhenwei Zhao, Leke Lin, Changsheng Lu, and Tan Qu (2018), Modified model of equivalent height for predicting atmospheric attenuation at frequencies below 350GHz, IET MICROWAVES ANTENNAS & PROPAGATION, 12(8), 1420-1427, doi:10.1049/iet-map.2017.1073.