@Article{JMS-52-0,
author = {},
title = {Preface},
journal = {Journal of Mathematical Study},
year = {2019},
volume = {52},
number = {3},
pages = {0--0},
abstract = {},
issn = {2617-8702},
doi = {https://doi.org/},
url = {http://global-sci.org/intro/article_detail/jms/13295.html}
}