参考文献:
Salvati, Mark E. Balog, James Aaron Shan, Weifang Giese, Soren Patent: US3/44 A, 3 US 344 A Title/Abstract Full Text Show Details Salvati, Mark E. Balog, James Aaron Shan, Weifang Giese, Soren Harikrishnan, Lalgudi S. Patent: US4/7766 A, 4 US 47766 A