IL’KIV, V. New forms of the Lopatynsky condition. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 77, n. 2, p. 107–122, 2025. DOI: 10.3842/umzh.v77i2.8534. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8534. Acesso em: 7 apr. 2025.