参考文献

Cesco-Cancian, Sergio; Chen, Hongfeng; Grimm, Jeffrey S.; Mani, Neelakandha S.; Mapes, Christopher M.; Palmer, David C.; Pippel, Daniel J.; Sorgi, Kirk L.; Xiao, Tong Patent: US2010/4450 A1, 2010 ; Location in patent: Page/Page column 22 ;