S. V. Gryshchuk, “Commutative сomplex algebras of the second rank with unity and some cases of the plane orthotropy. II”, Ukr. Mat. Zhurn., vol. 70, no. 10, pp. 1382–1389, Oct. 2018, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/1642