1. Grover P D.: Proceedings of the international workshop on biomass briquetting. New Delhi (1995).
2. Bhattacharya S C, Jungtiynont S, Santibuppakul P.: Proceedings of the international workshop on biomass briquetting. New Delhi, India (1995).
3. Kanafojski C, Karwowski T. : Theory and Construction , Foreign Scientific Publisher, Washington (1976).
4. Rehkuglar G E, Buchele W F. J. Trans of the ASAE Vol. 12-1(1996), p.69.
5. yangbo.: Henan agricultural university (2006).