参考文献

Conte, Aurelia; Dehmlow, Henrietta; Grether, Uwe; Kratochwil, Nicole A.; Kuehne, Holger; Narquizian, Robert; Panousis, Constantinos; Peters, Jens-Uwe; Ricklin, Fabienne; Roever, Stephan Patent: US2007/275987 A1, 2007 ; Location in patent: Page/Page column 22 ;