1. On the adjoint group of a radical ring;Amberg;Canad. Math. Bull.,1995
2. On some unsolved problems in quantum group theory;Drinfeld,1992
3. Set-theoretical solutions to the quantum Yang–Baxter equation;Etingof;Duke Math. J.,1999
4. The Theory of Groups;Hall,1973
5. Structure of rings;Jacobson;Amer. Math. Soc. Colloq. Publ.,1974