@Article{JMS-51-0,
author = {},
title = {Preface},
journal = {Journal of Mathematical Study},
year = {2018},
volume = {51},
number = {2},
pages = {0--0},
abstract = {},
issn = {2617-8702},
doi = {https://doi.org/},
url = {http://global-sci.org/intro/article_detail/jms/12457.html}
}