TY - JOUR
T1 - Preface
JO - Journal of Mathematical Study
VL - 2
SP - 0
EP - 0
PY - 2020
DA - 2020/05
SN - 53
DO - http://doi.org/
UR - https://global-sci.org/intro/article_detail/jms/16800.html
KW - 
AB -