L. Goncalves, and A. Vieira. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 177 (1):
76-78(1998)International Conference on Magnetism, CAIRNS, AUSTRALIA, JUL 27-AUG 01,
1997.
F. Lima, J. Moreira, J. Andrade, and U. Costa. PHYSICA A, 283 (1-2):
100-106(2000)VIth Latin American Workshop on Nonlinear Phenomena LAWNP'99/XIIth
MEDYFINOL Conference on Statistical Physics of Dynamic and Complex
Systems, CORDOBE, ARGENTINA, OCT 12-16, 1999.