@article{
  author = {Shokouhfar, Alireza, Khani, Sahar},
  title = {Investigation of combined effect of biological and chemical fertilizers 
of phosphorus and nitrogen on quantitative and 
qualitative characteristics of sunflower (Helianthus annuus L.)},
  journal = {Journal of Plant production Sciences},
  year = {2019},
  volume = {8},
  number = {2},
  pages = {83-93},
  doi = {}
}