参考文献

Gomtsyan, Arthur; Bayburt, Erol K.; Schmidt, Robert G.; Lee, Chih-Hung; Brown, Brian S.; Jinkerson, Tammie K.; Koenig, John R.; Daanen, Jerome F.; Latshaw, Steven P. Patent: US2006/128689 A1, 2006 ; Location in patent: Page/Page column 50 ;