参考文献

Lee, Jae-Gul; Leem, Won-Bin; Cho, Jong-Hwan; Choi, Sung-Hak; Lee, Jong-Jin; Park, Sang-Kuk; Lee, Tae-Hoo; Kim, Dong-Goo; Sung, Hyun-Jung Patent: US2003/166620 A1, 2003 ;