参考文献

Hermann, Johannes Cornelius; Lowrie, JR., Lee Edwin; Lucas, Matthew C.; Luk, Kin-Chun Thomas; Padilla, Fernando; Wanner, Jutta; Xie, Wenwei; Zhang, Xiaohu Patent: US2012/252777 A1, 2012 ; Location in patent: Page/Page column 72 ; US 20120252777 A1