参考文献

Tarur, Venkatasubramanian Radhakrishnan; Sathe, Dhananjay Govind; Bhise, Nandu Baban; Sawant, Kamlesh Digambar; Naik, Tushar Anil; Srivastav, Neeraj; Deore, Raviraj Bhatu Patent: US2008/275241 A1, 2008 ; Location in patent: Page/Page column 10 ;