@article { author = {}, title = {Introduction of documents}, journal = {Social Security Journal}, volume = {5}, number = {2}, pages = {285-322}, year = {2003}, publisher = {Social Security Research Institute}, issn = {1563-0781}, eissn = {}, doi = {}, abstract = {}, keywords = {}, title_fa = {اسناد (مقاوله نامه و توصیه نامه)}, abstract_fa = {}, keywords_fa = {}, url = {https://qjo.ssor.ir/article_60483.html}, eprint = {https://qjo.ssor.ir/article_60483_a3a8351010776f15fbad0a1b95fbfa2d.pdf} }