JOURNAL OF THE KOREAN PHYSICAL SOCIETY, vol. 48, no. 3, page. 446 - 450, 2006-03
PHYSICA STATUS SOLIDI B-BASIC RESEARCH, vol. 241, no. 7, page. 1494 - 1497, 2004-06
JOURNAL OF PHYSICAL CHEMISTRY C, vol. 114, no. 8, page. 3675 - 3680, 2010-03-04