参考文献

Holloway, M. Katharine; Liverton, Nigel J.; Ludmerer, Steven W.; McCauley, John A.; Olsen, David B.; Rudd, Michael T.; Vacca, Joseph P.; McIntyre, Charles J. Patent: US2007/27071 A1, 2007 ; Location in patent: Page/Page column 78 ; US 20070027071 A1