Volchkov VV, Volchkov VV, Savost’yanova IM. One Problem Connected with the Helgason Support Problem. Ukr. Mat. Zhurn. [Internet]. 2015Sep.25 [cited 2024Nov.24];67(9):1189-200. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/2058