参考文献

Pal, Manojit; Rao, Yeleswarapu Koteswar; Khanna, Ish; Swamy, Nalivela Kumara; Subramanian, Venkataraman; Batchu, Venkateswara Rao; Iqbal, Javed; Pillarisetti, Sivaram Patent: US2006/128729 A1, 2006 ; Location in patent: Page/Page column 77 ;