@article{oai:nagoya.repo.nii.ac.jp:00020342,
 author = {SAO, Kazuo and KAMADA, Tetsuo},
 journal = {Proceedings of the Research Institute of Atmospherics, Nagoya University},
 month = {Mar},
 pages = {35--37},
 title = {Section 1. Propagation of Atmospherics and ELF Radio Noise},
 volume = {20},
 year = {1973}
}