@article { author = {}, title = {تصویر روی جلد}, journal = {خبرنامه انجمن ریاضی ایران}, volume = {41}, number = {165-166}, pages = {-}, year = {2021}, publisher = {انجمن ریاضی ایران}, issn = {۰۰۰۰-۰۰۰۰}, eissn = {}, doi = {}, abstract = {}, keywords = {}, url = {https://nims.ims.ir/article_142415.html}, eprint = {https://nims.ims.ir/article_142415_ba2ea63fae6fb419a18668d3fb8e1689.pdf} }