GryshchukS. V. “Commutative сomplex Algebras of the Second Rank With Unity and Some cases of the Plane Orthotropy. II”. Ukrains’kyi Matematychnyi Zhurnal 70, no. 10 (October 25, 2018): 1382-1389. Accessed November 21, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/1642.