PHYSICAL REVIEW B, vol. 79, no. 19, page. 195327 - 195327, 2009-05
PHYSICAL REVIEW B, vol. 76, no. 3, page. 35316 - 35316, 2007-07
PHYSICA C, vol. 355, no. 1-2, page. 172 - 178, 2001-06-01