Kozubovskaya IG. On defence of theses at Academic Council of the Institute of Mathematics of the Academy of Sciences of the Ukrainian SSR in 1970—1971 . Ukr. Mat. Zhurn. [Internet]. 1971Jun.29 [cited 2024Sep.1];23(4):564-8. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/8594