参考文献

Bourrain, Sylvie; Hunt, Peter Alan; Huscroft, Ian Thomas; Kulagowski, Janusz Jozef; London, Clare; Naylor, Elizabeth Mary; Raubo, Piotr Antoni; Seward, Eileen Mary Patent: US2004/229864 A1, 2004 ; Location in patent: Page/Page column 6 ; US 20040229864 A1