| 1 Li L, Zhang P. Twisted Hopf Algebras, Ringel-Hall Algebras, and Green’s Categories. J Algebra, 2000,
231: 713-743
2 Green J A. Hall algebras, hereditary algebras and quantum groups. Invent Math, 1995,120: 361-377
3 Green J A. Quantum groups, Hall algebras, and quantized shuffles. In: Cabanes M ed, Finite Reductive
Groups, Related Structures and Representations. Boston: Birkhauser, 1996
4 Ringel C M. Hall algebras revisited. Israel Math Conf Proc, 1993,7: 171-176
5 Sweedler M E. Hopf Algebras. New York: Benjamin, 1969 |