1.
Burskii VP. On equivariant extensions of a differential operator by the example of the Laplace operator in a circle. Ukr. Mat. Zhurn. [Internet]. 1999 Feb. 25 [cited 2025 Dec. 6];51(2):158–169. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/4595