Vahidpour, H., Zaefarian, F., Nazari, S., & Mansoori, I. "Effect of different levels of nitrogen and planting density on rapeseed (Brassica napus L.) and lepyrodiclis (Lepyrodiclis holosteoides Fenzl.) competition", Iranian Journal of Field Crop Science, 50, 4, 2020, 63–74. doi: 10.22059/ijfcs.2019.260960.654493