参考文献

Lee, Chih-Hung; Perner, Richard J.; Larson, Daniel P.; Koenig, John R.; Gomtsyan, Arthur R.; Zheng, Guo Zhu; DiDomenico, Stanley; Stewart, Andrew O.; Bayburt, Erol K. Patent: US2002/173665 A1, 2002 ; US 20020173665 A1