1. Semisimple strongly graded rings;Aljadeff;J. Algebra,2002
2. Finite-dimensional simple graded algebras;Bahturin;Mat. Sb.,2008
3. Elements of Mathematics. Commutative Algebra;Bourbaki,1972
4. Cohomology of Groups;Brown,1994
5. Representation Theory and Complex Geometry;Chriss,1997