参考文献

Kumar, Ashok; Nimbalkar, Manmohan Madhavrao; Barve, Sanjay Govind; Metil, Dattatray Shamrao; Kelkar, Rahul Suresh; Shimpukade, Bharat Dinkar; Kushwaha, Lavkesh Dayashankar Patent: US2006/281801 A1, 2006 ; Location in patent: Page/Page column 7 ;