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Kang, Seok-Jin; Kim, Jeong-Ah; Lee, Hyeonmi; Shin, Dong-Uy
Trans. Amer. Math. Soc. 356 (2004), 2349-2378
Kang, Seok-Jin; Kim, Jeong-Ah; Shin, Dong-Uy
Publ. RIMS 40 (2004), 758-791
J. Algebra 274 (2004) 629-642.