TYCHYNIN, V. A. Nonlocal transformations with additional variables. Forced symmetries. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 74, n. 3, p. 400–417, 2022. DOI: 10.37863/umzh.v74i3.6995. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/6995. Acesso em: 5 dec. 2025.