@article { author = {}, title = {Introduction of documents}, journal = {Social Security Journal}, volume = {3}, number = {3}, pages = {237-291}, year = {2001}, 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_60442.html}, eprint = {https://qjo.ssor.ir/article_60442_bbe207bb6ea88ebc878e6518baafcfe3.pdf} }