REFERENCES
[1] Albert, A. A. - Structure of Algebras, Amer. Math. Soc, Colloquium Publications, Vol. 24, New York (1939).         [ Links ]
[2] da Motta Ferreira, J. C. et Micali, A. - Sur les algebres nucléaires, Indagationes Mathematicae 7 (3), pp. 331-342 (1996).         [ Links ]
[3] Rich, M. - Rings with idempotents in their nuclei, Trans. Amer. Math. Soc. 208, pp. 81-90 (1975).         [ Links ]
[4] Schafer, R. D. - An introduction to nonassociative algebras, Academic Press, New York and London (1966).         [ Links ]
[5] Schafer, R. D. - The Wedderburn principal theorem for alternative algebras, Bull. Amer. Math. Soc. 55, pp. 604-614 (1949).         [ Links ]
[6] Zhevlakov, K. A.; Slin'ko, A. M.; Shestakov, I. P. and Shirshov, A. I. - Rings that are nearly associative, Inst. Math. Acad. Sci. of the U.S.S.R., Siberian Branch Novosibirsk, U. S. S. R., Academic Press, New York and London (1982).        [ Links ]

JOAO CARLOS DA MOTTA FERREIRA
Universidade Federal do ABC
Centro de Matemática, Computac.áo e Cognigáo
09210-170 Santo André
SP - Brasil
e-mail : joao.cmferreira@ufabc.edu.br

ARTIBANO MICALI
Université Montpeflier II
Département des Sciences Mathématiques
Place Eugene Bataillon
34095 Montpellier, France
e-mail : micali@univ.montp2.fr

Received : June 2006. Accepted : June 2007