参考文献

Lee, Jeong Ik; Chu, Hye Yong; Lee, Hyoyoung; Oh, Ji Young; Kim, Seong Hyun; Do, Lee-Mi; Zyung, Taehyoung; Lee, Jaemin; Jung, Byung-Jun; Shim, Hong-Ku Patent: US2003/87127 A1, 2003 ;