@Article{MC-12-4,
author = {},
title = {封面},
journal = {数学文化},
year = {2021},
volume = {12},
number = {4},
pages = {0--0},
abstract = {},
issn = {2617-8656},
doi = {https://doi.org/2021-MC-20004},
url = {https://global-sci.com/article/89281/%E5%B0%81%E9%9D%A2}
}