参考文献

Conte, Aurelia; Dehmlow, Henrietta; Grether, Uwe; Kratochwil, Nicole A.; Kuehne, Holger; Narquizian, Robert; Panousis, Constantinos G.; Peters, Jens-Uwe; Ricklin, Fabienne Patent: US2008/234277 A1, 2008 ; Location in patent: Page/Page column 18 ; US 20080234277 A1