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JOURNAL OF PURE AND APPLIED ALGEBRA, vol. 213, no. 10, page. 1911 - 1915, 2009-10

JOURNAL OF THE EUROPEAN MATHEMATICAL SOCIETY, vol. 11, no. 6, page. 1429 - 1443, 2009-01

JOURNAL OF PURE AND APPLIED ALGEBRA, vol. 211, no. 1, page. 51 - 54, 2007-10

MANUSCRIPTA MATHEMATICA, vol. 122, no. 3, page. 353 - 363, 2007-03

JOURNAL OF PURE AND APPLIED ALGEBRA, vol. 204, no. 2, page. 270 - 279, 2006-02

COMMUNICATIONS IN ALGEBRA, vol. 34, no. 9, page. 3153 - 3165, 2006-01

JOURNAL OF PURE AND APPLIED ALGEBRA, vol. 182, no. 2-3, page. 239 - 252, 2003-08-01

JOURNAL OF ALGEBRA, vol. 251, no. 2, page. 529 - 537, 2002-05-15

COMMUNICATIONS IN ALGEBRA, vol. 30, no. 12, page. 5955 - 5960, 2002-01

HOUSTON JOURNAL OF MATHEMATICS, vol. 28, no. 4, page. 701 - 710, 2002-01

JOURNAL OF PURE AND APPLIED ALGEBRA, vol. 146, no. 3, page. 283 - 290, 2000-03-02

COMMUNICATIONS IN ALGEBRA, vol. 28, no. 5, page. 2533 - 2542, 2000-01

HOUSTON JOURNAL OF MATHEMATICS, vol. 26, no. 1, page. 67 - 81, 2000-01