参考文献:
Pettersson, Martin Youngjin Johnson, Douglas Scott Subramanyam, Chakrapani O Donnell, Christopher John Ende, Christopher William Am Fish, Benjamin Adam Green, Michael Eric Mullins, Patrick Bradley Stiff, Cory Michael Tran, Tuan Phong Navaratnam, Thayalan Patent: US0/5758 A, 0 Location in patent: Page/Page column 69