JOURNAL OF THE KOREAN PHYSICAL SOCIETY, vol. 63, no. 3, page. 681 - 685, 2013-08
JOURNAL OF THE KOREAN PHYSICAL SOCIETY, vol. 63, no. 3, page. 624 - 626, 2013-08
JOURNAL OF THE KOREAN PHYSICAL SOCIETY, vol. 61, no. 9, page. 1528 - 1531, 2012-11