Hyun-Jae Na, Won-Kyu Lee, Ji-Hun Lim, Byoung-Yong Kim, Young-Hwan Kim, Chul-Ho Ok, Dae-Shik Seo, Sang-Do Lee, Jae-Hoon Lee and Jong-Gyu La
Liquid Crystals 37 ( 1 ): 109 - 114 , 2010