Anon. 1979. Equipment for working the soil - Disks - Classification,main fixing dimensions and specifications. ISO 5679.
Anon. 2002. Agricultural statistical bulletin. Deputy of planning and economy. Information technology and statistical office. No. 2003/03. (in Farsi)
Ben-Dor, Y. 1982. Agricultural implement for extraction and shredding of stalks and roots. US Patent. No. 4350207.
Bezzerides, P. A. 1978. Stubble eradicating implement. US Patent. No. 4131163.
Borchard, M. A. 2001. Apparatus and method for removing plant stalks from a field and shreedding the plant stalks. US Patent. No. 6185919.
Bradford, J. M. and Smart, J. R. 1997. Conservation tillage offers new hope: Sustaining agriculture in drought years. USDA/ARS.
Hobbs, O. K. 1999. Method and apparatus for Pulling and chopping plant stalks. US Patent. No. 5935895.
Kepner, R. A., Bainer, R. and Barger, E. L. 1992. Principles of Farm Machinery. Translated by Shafii, S. A. Vol. 1. Tehran University Pub. (in Farsi)
Kohel, R. J. and Lewis, C. F. 1995. Cotton. Translated by Naseri, F. Deputy of Cultural Astan Ghods Razavi. (in Farsi)
Loyd, D. 1996. Method and apparatus for removing plant stalks. US Patent. No. 5482120.
Lubetzky, Y. and Svavolsky, Z. 1988. Stalk puller and shredder machine. US Patent. No. 4751812.
Mansur, P. L. 1999. Stalk puller and chopper assembly. US Patent. No. 5941316.
Orthman, H. K. 1986. Cotton root cutter and shredder. US Patent. No. 4588033.
Rouzi, A. 1995. Hydraulically powered stalk and root shredder. US Patent. No. 5467828.
Stikeleather, L. F. and Totten, D. S. 1982. Ridge mulch tillage method and apparatus. US Patent. No. 4323126.
Thacker, G. W. and Coates, W. E. 1994. Stalk and root embedding apparatus. US Patent. No. 5285854.