1. C.W.P.M. Sillen, L. Postma, E.A. Draaisma and F.A. Pronk, Philips J. Res, this issue.
2. Tribology and Mechanics of Magnetic Storage Devices;Bhushan,1990
3. Theory of Magnetic Recording;Bertram,1994
4. Short-wavelength Magnetic Recording, New Methods and Analyses;Ruigrok,1990