Kirnasovskii, O. Yu. 1998. “Balanced Identity That Describes N-Ary Group Isotopes in the Class of All N-Ary Quasigroups”. Ukrains’kyi Matematychnyi Zhurnal 50 (6): 862–864. https://umj.imath.kiev.ua/index.php/umj/article/view/4897.