参考文献

Sun, Xuehui; Nappa, Mario Joseph; Rao, Velliyur Nott Mallikarjuna; Petrov, Viacheslav A.; Swearingen, Ekaterina N.; Delyagina, Nina Ivanovna; Cherstkov, Victor Filippovich Patent: US2008/27250 A1, 2008 ; Location in patent: Page/Page column 3 ;