@article{
  author = {Siami, Koroush, Yaghoubi, Saeed Reza, Faramarzi, Ali, Javadi, Mohammad},
  title = {Effect of redroot pigweed (Amaranthus retroflexus L.) in various densities and emergence times on yield and yield components of sunflower (Helianthus annus L.)},
  journal = {Agroecology Journal},
  year = {2008},
  volume = {4},
  number = {3},
  pages = {49-61},
  doi = {}
}