@Article{MC-3-4, author = {}, title = {封面}, journal = {数学文化}, year = {2012}, volume = {3}, number = {4}, pages = {0--0}, abstract = {}, issn = {2617-8656}, doi = {https://doi.org/2012-MC-11583}, url = {https://global-sci.com/article/89970/%E5%B0%81%E9%9D%A2} }