-
Alves Jorge S.M., “On Graded Central Polynomials of the Graded Algebra M-2(E)”, Comm Algebra, 38:6 (2010),
2184–2198 
-
Brandao Antonio Pereira J., Koshlukov P., “Central polynomials for Z(2)–graded algebras and for algebras with involution”, Journal of Pure and Applied Algebra, 208:3 (2007),
877–886