BEZKOROVAINA, L. L. New criterion for the analyticity of a function: representation via the metric tensors of the surfaces $Z = u, Z = v$. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 71, n. 5, p. 596–609, 2019. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1460. Acesso em: 5 dec. 2025.