1. S.S. Papell, US Patent No. 3215572, 1965.
2. J. Shimoiizaka et al., 19th Annual Meeting of the Chemical Soc. of Japan, 1966, p. 293.
3. Preparation of aqueous magnetic liquids in alkaline and acidic media
4. I. Nakatani, Proceedings of the International Symposium on Hydrodynamics of Magnetic Fluids and it's Application (ISHMFA'97) July 18–20, 1997, p. 9.
5. Y. Sasaki, K. Nakatsuka, Annual Meeting of the Magnetic Fluid Association of Japan, 1991, p. 43.