1.
Artemovich OD. On <em class="a-plus-plus">I</em>-Rigid and <em class="a-plus-plus">q</em&gt;-Rigid Rings. Ukr. Mat. Zhurn. [Internet]. 1998Jul.25 [cited 2024May19];50(7):989–993. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/4878