TY - JOUR AU - admin, PY - 2020/12/25 Y2 - 2024/03/29 TI - Cover, Volume 54, Number 2 JF - Matematychni Studii JA - Mat. Stud. VL - 54 IS - 2 SE - Cover and Table of Contents DO - UR - http://matstud.org.ua/ojs/index.php/matstud/article/view/163 SP - AB - ER -