JOURNAL OF PHYSICS-CONDENSED MATTER, vol. 16, no. 50, page. 9163 - 9168, 2004-12-22
PHYSICAL REVIEW LETTERS, vol. 93, no. 15, 2004-10-08
PHYSICA STATUS SOLIDI B-BASIC RESEARCH, vol. 241, no. 7, page. 1529 - 1532, 2004-06
JOURNAL OF PHYSICS-CONDENSED MATTER, vol. 16, no. 18, page. 3257 - 3269, 2004-05-12