Koocheki, A., Nasiri mahalati, M., Tabrizi, L., Azizi, E., & Jahan, M. "Assessing species and functional diversity and community structure for weeds in wheat and sugar beet in Iran", Iranian Journal of Field Crops Research, 4, 1, 2006, 105-130. doi: 10.22067/gsc.v4i1.1322