参考文献

Liu, Jin-Jun; Luk, Kin-Chun; Pizzolato, Giacomo; Ren, Yi; Thakkar, Kshitij Chhabilbhai; Wovkulich, Peter Michael; Zhang, Zhuming Patent: US2006/79511 A1, 2006 ; Location in patent: Page/Page column 17 ; US 20060079511 A1