Arutyunov, Andronick Aramovich, and Sergey Evgen’evich Zhukovskiy. 2017. “Existence of the \(N\)-Th Root in Finite-Dimensional Power-Associative Algebras over Reals”. Eurasian Mathematical Journal 8 (3):28–35. https://emj.enu.kz/index.php/main/article/view/668.