PARTICLE INTERACTION EFFECTS IN FERROFLUIDS N. Y. Ayoub, B. Abu-Aisheh, N. Laham, M. Dababneh, J. Popplewell and K. O'Grady J. Phys. Colloques, 49 C8 (1988) C8-1841-C8-1842 DOI: 10.1051/jphyscol:19888842