参考文献:
Keegan, Kathleen S. Kesicki, Edward A. Gaudino, John Joseph Cook, Adam Wade Cowen, Scott Douglas Burgess, Laurence Edward Patent: US200/69284 A, 200 US 2000069284 A
参考文献:
UNIVERSITA DEGLI STUDI DI SIENA GIULIANI, Germano CAPPELLI, Andrea VOMERO, Salvatore ANZINI, Maurizio Patent: WO20/74 A, 20 Location in patent: Page/Page column 29-0