@article { author = {}, title = {تصویر پشت جلد}, journal = {خبرنامه انجمن ریاضی ایران}, volume = {43}, number = {2}, pages = {-}, year = {2022}, publisher = {انجمن ریاضی ایران}, issn = {۰۰۰۰-۰۰۰۰}, eissn = {}, doi = {}, abstract = {}, keywords = {}, url = {https://nims.ims.ir/article_162941.html}, eprint = {https://nims.ims.ir/article_162941_a78700abd3f93d92cd1556e2cf0a7ed0.pdf} }