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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. 130, no. 11, page. 3125 - 3131, 2002-01

PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY, vol. 131, no. 1, page. 65 - 75, 2003-01

PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY, vol. 131, no. 11, page. 3309 - 3317, 2003-01

PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY, vol. 132, no. 5, page. 1393 - 1401, 2004-01

PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY, vol. 136, no. 5, page. 1559 - 1563, 2008-01