PHYSICAL REVIEW B, vol. 88, no. 12, page. 125111-1 - 125111-5, 2013-09-06
PHYSICAL REVIEW B, vol. 86, no. 5, page. 54417-1 - 54417-8, 2012-08-13
PHYSICAL REVIEW LETTERS, vol. 110, no. 24, page. 247202-1 - 247202-5, 2013-06-11