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2. Ferrofluids — properties and applications;Raj;Mater. Des.,1987
3. Catalog of Standard and Replacement Ferrofluidic Feedthroughs, Ferrofluidics Corporation, U.S.A.
4. The status of magnetic liquid seals;Bailey,1978
5. The role of magnetic fluid seals in modern machinery;Wilcock;Lubr. Eng.,1984