参考文献

Iwata, Hidehisa; Kohara, Yasuhisa; Cao, Sheldon X.; Guntupalli, Prasuna; Gwaltney, Stephen L.; Hosfield, David J.; Liu, Yan; Stafford, Jeffrey A.; Throop, Beverly Patent: US2010/69431 A1, 2010 ; Location in patent: Page/Page column 23 ;