1. e.g., J. L. Dormann and D. Fiorani, eds., Studies of Magnetic Properties of Fine Particles, Elsevier Science Publishers (1992).
2. L. Gunther and B. Barbara, eds., Quantum Tunneling of Magnetization -QTM ’94, Kluwer Academic Publishers (1995).
3. R. H. Kodama, A. E. Berkowitz, E. J. McNiff Jr., S. Foner, Phys. Rev. Lett. 77, 394 (1996).
4. L. Néel, Journal of the Physical Society of Japan 17, SuppL B-l, 676(1962).
5. L. S. Jacobs and C. P. Bean in MAGNETISM III, eds. G. T. Rado and H. Suhl, Academic Press (1963), pp. 294 – 298.