Sokhats’kyiF. M. (2002) “Abstract Characteristic of the Class of Unitary Positional Algebras of Operations”, Ukrains’kyi Matematychnyi Zhurnal, 54(7), pp. 961-968. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4132 (Accessed: 27July2024).