参考文献:
Brinkman, John A. Cheung, Adrian Wai-Hing Firooznia, Fariborz Guertin, Kevin Richard Marcopulos, Nicholas Qi, Lida Racha, Jagdish Kumar Sarabu, Ramakanth Tan, Jenny Tilley, Jefferson Wright Patent: US2007/2704 A, 2007 Location in patent: Page/Page column 47 US 200702704 A