参考文献

Barth, Hubert; Bridges, Alexander James; Heemstra, Ronald J.; Horne, Nicole Marcia; Hughes, Robert Craig; Jacks, Thomas Elliott; McNamara, Dennis Joseph; Schneider, Simon; Steiner, Klaus; Toogood, Peter Laurence; Winters, Roy Thomas Patent: US2004/158065 A1, 2004 ; Location in patent: Page 20 ;