1- Abu Zeid, E. N. and Balba, L. K. 2010. Seedling growth and yield quality of Valeriana officinalis affected by simulated sorghum (Sorghum bicolor) as a weed. Egypt. J. Appl. Sci., 33(2): 102-112.
2- Akhavan Sales, M. and Moshfeghi, N. 2008. Seed dormancy breaking in Lambsquarters (Chenopodium album). Agronomy, BirjandUniversity.
3- Arif, M., Jan, T. and Javed, N. 2011. Effect of weeds interference on various wheat cultivars. Sarhad J. Agric., 22: 27-29.
4- Cavero, J., Zaragoza, C., Bastiaans, L., Suso, M. L. and Pardo, A. 2009. The relevance of morphological plasticity in the simulation of competition between maize and Datura stramonium. Weed Res., 40: 163-180.
5- Gupta, O. P. 2011. Modern weed management. Agrobios Publ., India, 339p.
6- Hosseini, A., Koocheki, A. and Nassiri Mahalati, M. 2007. Critical period of weed control in cumin (Cuminum cyminum). Iran J. Crop Res., 4(1): 23-34.
7- Ibrahim, R., Ujalan, R. and Ali, I. 2009. Evaluation of interference among some dominant weeds and fennel (Foeniculun vulgare) at Izmir region. African J. Med. Plant Res., 5(1): 8-13.
8- Kavaliauskaite, D. and Bobinas, C. 2006. Determination of weed competition critical period in red beet. Agron Res., 4: 217-220.
9- Kropff, M. J. and Van Laar, H. H. 1993. Crop-weed interactions. CAB international, Wallingford, UK.
10- Mahmoudi, S. 2003. Ecophysiological study between Lambsquarters (Chenopodium album) and corn (Zea mays). Ph.D. Thesis in Agronomy, Faculty of Agriculture, TehranUniversity, 210p.
11- Mirshekari, B. 2010. Efficiency of empirical competition models for simulation of sugar beet (Beta vulgaris L.) yield at interference with redroot pigweed (Amaranthus retroflexus L.). Sugar beet J., 24(2): 73-91.
12- Mirshekari, B. 2010. Yield and harvest index of sunflower (Helianthus annus) in monoculture and competition with redroot pigweed (Amaranthus retroflexus). Modern Sci. Sustain. Agric. J., 6(18): 73-88.
13- Mirshekari, B. 2011. Cultivation of Medicinal and Spice Crops. Islamic AzadUniversity Publ. 209p.
14- Rabbit, K. and Singh, W. 2012. Botanical study of pot marigold (Calendula officinalis). Ruhi Publ, New Delhi, India.
15- Rajcan, I. and Swanton, C. J. 2001. Understanding maize-weed competition: Resource competition, light quality and the whole plant. Field Crops Res., 71(2): 139-150.
16- Rohris, M. and Stunzel, H. 2001. Canopy development of Chenopodium album in pure and mixed stands. Weed Res., 41: 111-128.
17- Ronald, A. E. and Smith, E. C. 2000. The flora of the Nova Scotia. HalifNova ScotiaMuseum, 746p.
18- Scheepens, P.C., Lempennar, C., Andereasen, C., Eggers, T. H., Netland, J. and Vurro, M. 1997. Biological control of annual weed Chenopodiun album, with emphasis on the application of Ascochyta caulina as a microbial herbicide. Integrated Pest Manag. Rev., 2: 71-76.
19- Shurrtleff, J. L. and Coble, H. D. 1985. The interaction of soybean (Glycine max) and five weed species in the greenhouse. Weed Sci., 33: 669-672.
20- Swanton, C. J. and Murphy, S. D. 1996. Weed science beyond the weeds: The role of integrated weed management (IWM) in agro-ecosystem health. Weed Sci., 44: 437-445.
21- Tollenaar, M., Dibo, A. A., Aguilera, A., Weise, S. F. and Swanton, C. J. 1994. Effect of crop density on weed interference in maize. Agro J., 86: 591-595.
22- Traore, R., Mauro, A. R., Dirceu, A. and Alvadi, A. B. J. 2003. Interference of sorghum cultivars with weeds. Proc.FloridaState Hort. Soc., 110: 117-120.
23- Wellmann, A. and Marlander, B. 1996. Effect of time of weed emergence on competition between sugar beet and Chenopodium album. Zucker Industry, 121(8): 595-600.
)