REZAEE, A., A. SOLTANI, 1996. Introduction to potato (Solanum tuberosum) Production Jihad-e Daneshgahi press of Mashhad. 179 pp. (Farsi translation by A. Rezaee and A. Soltani)
BURNSIDE, O. C. 1970. Progress and portentical for nonherbicidal control of weed through preventive weed control. In FAO International Conference on Weed Control, ed. J. T. Holstum, Jr. Urbana, IL: Ameriean Weed Sci. Soc., pp. 464-483.
BUSSAN, A. J., O. C. BURNSIDE, J. H. ORF, E. A. RISTAU and K. J. PUETTMANN, 1997. Field evaluation of Soybean (Glycine max) genotypes for weed competitiveness. Weed. sci. 45: 31-37.
CHALLAIAH, R. E., G. A. WICKS, O. C. BURNSIDE and A. V. JOHNSON, 1983. Evaluation of competitive ability of winter wheat cultivars. Proc. North Cent. Weed Cont. Conf. 38: 85-91.
FRICK, B. and E. JOHNSON, 2002. Growing a competitive crop-first step in weed control. Canada-Saskatchewan Agri-Food Innovation Fund. 123-124
HADIZADEH, M., H. RAHIMIAN MASHHADI, 1998. The critical period of weed control in soybean. Iranian journal of plant pathology. Vol. 34.
JAVANBAKHT HESAR, M. 1996. Determine the critical weed control period in potato (Solanum tuberosum) at Bajgah area in Shiraz. M. S. Thesis, Agricultural college of Shiraz university (In Persian with English summary).
JORDAN, N. 1993. Prospects for weed control through weed suppression. Ecological Applications. 3: 84-91.
LEMERLE, D., G. S. GILL, C. E. MURPHY, S. R. WALKER, R. D. COUSENS, S. MOKHTARI, S. J. PELTZER, R. COLEMAN and D. J. LUCKETT, 2001. Genetic improvement and agronomy for enhanced wheat competitiveness with weeds. Aust. J. Agric. Res., 52: 527-578
MURPHY, R., S. R. WALKER, R. D. COUSENS, S. MOKHTARI, S. J. PELTZER, R. COLEMAN and D. J. LUCKETT, 2001. Genetic improvement and agronomy for enhanced wheat competitiveness with weeds. Aust. J. Agric. Res. 52: 527-578
NELSON, D. C. and M. C. THORESON, 1981. Competition between Potatos (Solanum tuberosum) and weeds. Weed. sci. 29: 672-677.
NELSON, D. C. and J. F. GILES, 1989. Weed management in two potato (Solanum tubersoum) cultivars using tillage and pendimethalin. weed sci. 37: 228-232.
NIVAA, T. 1997. Netherlands catalogue of potato varieties.
NGOUAJIO, M., E. MILTON, Jr. MCGIFFEN and K. J. HEMBREE, 2001. Tolerance of tomato cultivars to velvet leaf interference. Weed Sci. 49: 91-98.
PARISH, S. 1990. A review of non chemical weed control techniques. Biol. agric. Hort. 7: 117-137.
RABY, B. J. and L. K. BINNING, 1985. Weed competition study in "Russet Burbank" and "Superior" potato (Solanum tuberosum) with different management practices. Proc. North Cent. Weed Control. Conf. 40:4
SHIRKHANI, A. 2001. Evolution of dry land pea competitiveness in different density of common weeds. M.S. Thesis, Agricultural college of Tehran university .137pp. (in Persian with English summary).
SWEET, R. D., C. P. Yip and J. B. Sieczku, 1974. Crop varieties can they suppress weeds? NY Food Life Sci. Q. 7: 3-5.
TODD, A. P., C. B. ORVIN and H. O. JAMES, 1999. Increasing crop competitiveness to weed through crop breeding. In Expanding the context of weed management. Douglas, D. B (eds) Food products press. pp: 59-72
VAN HEEMST, H. D. J. 1985. The influence of weed competition on crop yield. Agricultural systems. 18: 81-93
VANGESSEL, M. J. and K. A. RENNER, 1990. Effect of soil type, hilling time and weed interference on Potato (Solanum tuberosum) development and yield. Weed tech. 4: 299-305.
WASTON, P. R., D. A. DERKSEN., R. C. VAN ACKER., B. IRVINE., M. C. THERRIEN, M. H. ENTZ, 2002. The contribution of seed, seedling, and mature plant traits to barley cultivar competitiveness against weeds. pp.152-157
ZAND, E. 2000. The ecophysiological basis of the genetic improvement of Iranian wheat from 1956 to 1995. Ph.D. Thesis, Ferdwosi University of Mashhad, Mashhad, Iran.
ZAND, E. and H. J. BECKIE, 2001. Competitive ability of hybrid and open pollinated canola (Brassica napus) with wild oat (Avena fatua). Can. J. Plant Sci. 82: 473-480.
)