1. : Gas discharge phenomena (in Japanese), p. 96, 1971.
2. : Ann. Phys., 476, 729, 1925.
3. : Degree thesis at the University of of Tokyo, Dec. 1961.
4. Nat'l Research Committee of Air Pollution: Precipitation handbook (in Japanese), p. 152, Dec. 1961.
5. : Electrostatic Precipitation 235, 1963.