JAPANESE JOURNAL OF APPLIED PHYSICS, vol. 47, no. 11, page. 8275 - 8278, 2008-11
JOURNAL OF KOREAN MEDICAL SCIENCE, vol. 17, no. 5, page. 704 - 707, 2002-10
JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS, vol. 24, no. 5-6, page. 619 - 630, 2010-04