JAPANESE JOURNAL OF APPLIED PHYSICS, vol. 50, no. 2, 2011-02
BULLETIN OF THE KOREAN CHEMICAL SOCIETY, vol. 30, no. 10, page. 2280 - 2282, 2009-10-20
MATERIALS LETTERS, vol. 63, no. 23, page. 2025 - 2028, 2009-09-30