参考文献

Fuchs, Klaus; Eickmeier, Christian; Heine, Niklas; Peters, Stefan; Dorner-Ciossek, Cornelia; Handschuh, Sandra; Nar, Herbert; Klinder, Klaus Patent: US2010/144681 A1, 2010 ; Location in patent: Page/Page column 67 ; US 20100144681 A1