@article{
  author = {Abedi, S., peykani, G., Hoseini, S.},
  title = {Determining Comparative Advantages of Corn in Optimal
 Cropping
Pattern in Fars province: Case Study of Cold Arid and Semiarid
Zones},
  journal = {Agricultural Economics Research},
  year = {2009},
  volume = {1},
  number = {1},
  pages = {115-136},
  doi = {}
}