1. Ashkvary, M. 2008. Review of international trade of processed tomato products in the world and Iran position in this market. The first Conference of Production and processed Technology Tomato. Mashhad. (In Farsi).
2. Anonymous. 2009. Crop Statistics. Available from: http://dbagri.maj.ir/zrt/yearrep.asp.p:144&-9900. Accessed 15 September 2009. (In Farsi).
3. Peyvast, Gh., and A. Tafazzoli, 1999. Vegetable Farming. Guilan University press. (In Farsi).
4. Margolin, A., V. Bakshev, and S. R. Verma, 1986. Development of semi automatic transplanter. Acta- Horticultura. 187, 158.
5. Chen, J. M., C. C. Yu, J. H. Lei, J. M. Yu, and C. F. Chang. 1993. A multipurpose vacuum seed planter for vegetable crops plantings. Journal of Agriculture and Forestry 42 (1): 1-18.
6. Hanacek, W. A., and P. Bickel. 1984. Singulating Seeder for High Density Plug Trays. United States Patent. Patent No. 4,466,554.
7. Kim, D. E., Y. S. Chang, S. H. Kim, and G. I. Lee. 2003. Development of vacuum nozzle seeder for cucuribitaceous seeds (I)-design factors for vacuum seeding large sized seeds. Journal of the Korean Society for Agricultural Machinery 28 (6): 525-530.
8. Zigmanov, P. 1997. Efficiency of Machine Sowing of Vegetable Seed into Containers. Novi Sad, Yugoslavia.