F. M. Sokhats’kyi, “On the classification of functional equations on quasigroups”, Ukr. Mat. Zhurn., vol. 56, no. 9, pp. 1259–1266, Sep. 2004, Accessed: Apr. 13, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/3839