PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, vol. 111, no. 18, page. 6560 - 6565, 2014-05-06
PHYSICA B-CONDENSED MATTER, vol. 322, no. 3-4, page. 236 - 247, 2002-09
JOURNAL OF THE KOREAN PHYSICAL SOCIETY, vol. 36, no. 1, page. 54 - 59, 2000-01