PHYSICAL REVIEW LETTERS, vol. 107, no. 24, 2011-12-07
PHYSICAL REVIEW B, vol. 83, no. 14, page. 1444, 2011-04-22
PHYSICAL REVIEW LETTERS, vol. 103, no. 20, page. 207202 - 207202, 2009-11-13
PHYSICAL REVIEW B, vol. 80, no. 18, page. 180403 - 180403, 2009-11
PHYSICAL REVIEW B, vol. 76, no. 6, 2007-08
PHYSICAL REVIEW LETTERS, vol. 96, no. 4, 2006-02-03
PHYSICAL REVIEW LETTERS, vol. 90, no. 1, 2003-01-10