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PHYSICAL REVIEW B, vol. 62, no. 3, page. 1600 - 1603, 2000-07-15

PHYSICAL REVIEW B, vol. 64, no. 23, 2001-12-15

PHYSICAL REVIEW B, vol. 63, no. 11, page. 113408, 2001-03-15

PHYSICAL REVIEW B, vol. 67, no. 24, 2003-06-27

PHYSICAL REVIEW B, vol. 69, no. 19, 2004-05

PHYSICAL REVIEW B, vol. 68, no. 3, 2003-07-15

PHYSICAL REVIEW B, vol. 68, no. 12, 2003-09-15

PHYSICAL REVIEW B, vol. 67, no. 23, 2003-06-15

PHYSICAL REVIEW B, vol. 76, no. 3, 2007-07

PHYSICAL REVIEW B, vol. 65, no. 5, 2002-02-01