参考文献

Bolugoddu, Vijaya Bhaskar; Shukla, Sanjay; Jambula, Mukunda Reddy; Sagyam, Rajeshwar Reddy; Pingili, Ramchandra Reddy; Thirunavakarasu, Ananda Babu Patent: US2006/9640 A1, 2006 ; Location in patent: Page/Page column 8 ;