参考文献

STEURER, Steffen; BETZEMEIER, Bodo; MCCONNELL, Darryl; GERSTBERGER, Thomas; GRAUERT, Matthias; HOFFMANN, Matthias; IMPAGNATIELLO, Maria; van der VEEN, Lars; WEYER-CZERNILOFSKY, Ulrike Patent: US2007/270401 A1, 2007 ; Location in patent: Page/Page column 7 ;