@article{oai:nagoya.repo.nii.ac.jp:00019665,
 author = {SAO, KAZUO},
 journal = {Proceedings of the Research Institute of Atmospherics, Nagoya University},
 month = {Jun},
 pages = {17--18},
 title = {THE ECHO TYPE WAVEFORMS WITH OPPOSITE POLARITIES BUT ORIGINATED FROM THE IDENTICAL SOURCE},
 volume = {8},
 year = {1961}
}