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PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY, vol. 126, no. 3, page. 645 - 646, 1998-03

PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY, vol. 123, no. 9, page. 2625 - 2628, 1995-09

PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY, vol. 132, no. 9, page. 2809 - 2816, 2004-01

PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY, vol. 135, no. 8, page. 2309 - 2315, 2007-01

PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY, vol. 134, no. 9, page. 2711 - 2718, 2006-01

PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY, vol. 133, no. 7, page. 1935 - 1939, 2005-01

PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY, vol. 135, no. 9, page. 2855 - 2866, 2007-01

PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY, vol. 125, no. 4, page. 1131 - 1142, 1997-04

PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY, vol. 127, no. 7, page. 2175 - 2182, 1999-07

PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY, vol. 122, no. 2, page. 541 - 544, 1994-10