@Article{MC-7-0,
author = {},
title = {封面},
journal = {数学文化},
year = {2016},
volume = {7},
number = {4},
pages = {0--0},
abstract = {},
issn = {2617-8656},
doi = {https://doi.org/},
url = {http://global-sci.org/intro/article_detail/mc/11909.html}
}