Morozov, D. I. “Description of the Class of Strictly Differentiable Finite-State Isometries of the Ring $Z_2$”. Ukrains’kyi Matematychnyi Zhurnal 73, no. 9 (September 16, 2021): 1285 - 1288. Accessed April 20, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/6106.