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Kang, Seok-Jin; Lee, In-Sok; Lee, Kyu-Hwan; Oh, Hyekyung
J. Algebra 252 (2002) 258-292
Proc. London Math. Soc.(3) 89 (2004) 54-70
Kang, Seok-Jin; Lee, Dong-il; Lee, Kyu-Hwan; Park, Hyungju
J. Algebra 313 (2007) 988-1004