参考文献:
Ding, Qingjie Graves, Bradford James Kong, Norman Liu, Jin-Jun Lovey, Allen John Pizzolato, Giacomo Roberts, John Lawson So, Sung-Sau Vu, Binh Thanh Wovkulich, Peter Michael Patent: US2007/129416 A1, 2007 Location in patent: Page/Page column 30/2