1. 1) The Society of Chemical Engineers, Japan: Progress in Chemical Engineering 3 (Bubble·Drop Engineering), The Nikkan Kogyo Shimbun, Tokyo, (1969), 83, 113.
2. 2) The Society of Chemical Engineers, Japan: Progress in Chemical Engineering 16 (Bubble·Drop·Dispersion Engineering), Makishoten, Tokyo, (1982), 58, 125.
3. 3) Union Carbide: United States Patent 3743263, (1973).
4. The removal of solid particles from molten aluminum in the spinning nozzle inert flotation process
5. 5) Nippon Light Metal: Japan Patent 2094592.