参考文献:
GRÜNENTHAL GMBH FRANK, Robert CHRISTOPH, Thomas DAMANN, Nils LESCH, Bernhard BAHRENBERG, Gregor SAUNDERS, Derek John STOCKHAUSEN, Hannelore KIM, Yong-Soo KIM, Myeong-Seop LEE, Jeewoo Patent: WO0/68467 A, 0 Location in patent: Page/Page column 65 66