参考文献

Rehwinkel, Hartmut; Baeurle, Stefan; Berger, Markus; Schmees, Norbert; Schaecke, Heike; Krolikiewicz, Konrad; Mengel, Anne; Nguyen, Duy; Jaroch, Stefan; Skuballa, Werner Patent: US2005/131226 A1, 2005 ; Location in patent: Page/Page column 7 ;