参考文献

Das, Jagabandhu; Padmanabha, Ramesh; Chen, Ping; Norris, Derek J.; Doweyko, Arthur M.P.; Barrish, Joel C.; Wityak, John; Lombardo, Louis J.; Lee, Francis Y.F. Patent: US2004/54186 A1, 2004 ; Location in patent: Page 20 ; US 20040054186 A1