NESTERENKO, V.V. Sufficient conditions for the existence of points of symmetric quasicontinuity and of symmetric cliquishness of functions of two variables. Carpathian Mathematical Publications, [S. l.], v. 3, n. 2, p. 114–119, 2011. Disponível em: https://scijournals.pnu.edu.ua/index.php/cmp/article/view/3073. Acesso em: 2 may. 2024.