@Article{MC-12-4, author = {}, title = {封三}, journal = {数学文化}, year = {2021}, volume = {12}, number = {4}, pages = {0--0}, abstract = {}, issn = {2617-8656}, doi = {https://doi.org/2021-MC-20006}, url = {https://global-sci.com/article/89283/%E5%B0%81%E4%B8%89} }