参考文献

Svenstrup, Niels; Zimmermann, Holger; Karthaus, Dagmar; Goeller, Andreas; Heimbach, Dirk; Henninger, Kerstin; Lang, Dieter; Paulsen, Daniela; Riedl, Bernd; Schohe-Loop, Rudolf; Schuhmacher, Joachim; Wunberg, Tobias Patent: US2009/176842 A1, 2009 ; Location in patent: Page/Page column 11-12 ;