参考文献:
Dong, Han-Qing Foreman, Kenneth Li, An-Hu Mulvihill, Mark Joseph Panicker, Bijoy Steinig, Arno G. Stolz, Kathryn M. Weng, Qinghua Jin, Meizhong Volk, Brian Wang, Jing Wang, Ti Beard, James D. Patent: US27/29364 A, 27 Location in patent: Page/Page column 79 US 2729364 A