Geodesic
Group Gradings on Free Algebras of Nilpotent Varieties of Algebras
Serdica Mathematical Journal, Tome 38 (2012) no. 1-3, pp. 1-6.

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The main result is the classification, up to isomorphism, of all gradings by arbitrary abelian groups on the finitely generated algebras that are free in a nilpotent variety of algebras over an algebraically closed field of characteristic zero.
Keywords: Graded Algebra, Nilpotent Lie Algebra, Grading, Lie Algebra 
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Bahturin, Yuri. Group Gradings on Free Algebras of Nilpotent Varieties of Algebras. Serdica Mathematical Journal, Tome 38 (2012) no. 1-3, pp. 1-6. http://geodesic.mathdoc.fr/item/SMJ2_2012_38_1-3_a0/