@Article{MC-13-2, author = {}, title = {封面}, journal = {数学文化}, year = {2022}, volume = {13}, number = {2}, pages = {0--0}, abstract = {}, issn = {2617-8656}, doi = {https://doi.org/2022-MC-20530}, url = {https://global-sci.com/article/89176/%E5%B0%81%E9%9D%A2} }