@article{oai:nagoya.repo.nii.ac.jp:00020060,
 author = {SAO, Kazuo and KAMADA, Tetsuo},
 journal = {Proceedings of the Research Institute of Atmospherics, Nagoya University},
 month = {Mar},
 pages = {197--199},
 title = {Section 1 Propagation of atmospherics and ELF radio noise},
 volume = {16},
 year = {1969}
}