Abdollahian-Noghabi, M., and R. Froud. 1997. Competition above and below ground between fat hen (Chenopodium album L.) and two sugarbeet cultivars. Brighton Crop Protection Conference Weeds. Brighton, United Kingdom. pp. 44.
Alberts, R., and J. Thorner. 1997. Water stress effects on the content and organization of chlorophyll in mesophyll and bundle sheath chloroplasts of maize. Journal of Plant Physiology. 59: 353-361.
Bertholdsson, N.O. 2004. Variation in allelopathic activity over 100 years of barley selection and breeding. Journal of Weed Technoogy. 44: 78-86.
Dabbag, A., A. Javanshir, F. Sorkhi, F. Rahimzadeh, and S. Zahtab. 2005. Above and below ground interaction of wheat (Triticum aestivum L.) and wild oustria centerat (Avena fatua L.) XVII International Botanical Congress. Austria Center Vienna. pp .252
Gowik, U., and P. Westhoff. 2011. The path from C3 to C4 Photosynthesis. Journal of Plant Physiology. 155: 56–63.
Hashem, A., S.R. Radosevish, and R. Dick. 2000. Competition effects on yield, tissue nitrogen and germination of winter wheat (Triticum aestivum) and Italian ryegrass (Lolium multiflorum). Journal of Weed Technology. 14: 718-725.
Jones, R.E., and R.W. Medd. 2000. Economic thresholds and the case for longer term approaches to population management of weeds. Journal of Weed Technology. 14: 337-350.
Julio, A., and H. Emilio. 2005. Barley (Hordeum vulgare) and wild oat (Avena fatua) competition is affected by crop and weed density. Journal of Weed Technology. 19(4): 790-795.
Khan, I., G. Hassan, S. Khan, and S. Shah. 2012. Wheat-wild oats interactions at varying densities and proportions. Journal of Botany. 44(3): 1053-1057.
Kolb, L.N., E.R. Gallandt, and E.B. Mallory. 2012. Impact of spring wheat planting density, row spacing, and mechanical weed control on yield, grain protein, and economic return in maine. Journal of Weed Science. 60: 244- 253.
Krcek, M., P. Slamka, K. Olsovska, M. Brestic, and M. Bencikova. 2008. Reduction of drought stress effect in spring barley (Hordeum vulgare L.) by nitrogen fertilization. Journal of Plant Soil Environment, 54 (1): 7-13.
Olsen, J.M., H.W. Griepentrog, J. Nielsen, and J. Weiner. 2012. How important are crop spatial pattern and density for weed suppression by spring wheat? Journal of Weed Science. 60: 501-509.
Paynter, B.H., and A.L. Hills. 2009. Barley and rigid ryegrass (Lolium Rigidum) competition is influenced by crop cultivar and density. Journal of Weed Technology. 23: 40-48.
Porazar, R., and H. Ghadire. 2002. Competition wild oat (Avena fatua) with three varieties of wheat (Triticum aestivum) in greenhouse condition. Crop Sciences. 3 (2): 59-72.
Semers, T., and R.J. Froud. 2001. The effects of pea cultivar and water stress on root and shoot competition between vegetative plants of maize and pea. Journal of Ecology. 338: 137-145.
Siddiqui, I., B. Rukhsana, Z. Huma, and A. Aid. 2010. Effect of six problematic weeds on growth and yield of wheat. Journal of Botany. 42(4): 2461-2471.
Sorkhi, F., A. Dabbag, and A. Javanshir. 2008. Assessment of leaf characteristics and root to shoot ratio in above and below ground interference of wheat (Triticum aestivum) and different densities of wild oat (Avena fatua L.). Iranian Journal of Science and Technology of Agricultural and Natural Resources. 12(45): 435-447. (In Persian).
Sorkhi, F., A. Dabbag, A. Javanshir, F. Rahimzadeh, and S. Zahtab. 2006. Competitive effects of different plant parts of wild oat (Avena fatua L.) on morphological characters and yield of wheat (Triticum aestivum L.). Iranian Journal of Agricultural Science. 1 (16): 25-28. (In Persian).