参考文献

Dominique, Romyr; Goodnow, JR., Robert Alan; Kowalczyk, Agnieszka; Lou, Jianping; Qiao, Qi; Siddurl, Achyutharao; Tilley, Jefferson Wright Patent: US2009/227603 A1, 2009 ; Location in patent: Page/Page column 55-56 ; US 20090227603 A1