ON KURATOWSKI MEASURE OF NONCOMPACTNESS IN R 2 WITH THE RIVER METRIC. Balkan Journal of Applied Mathematics and Informatics, [S. l.], v. 3, n. 2, p. 59–68, 2020. Disponível em: https://js.ugd.edu.mk/index.php/bjami/article/view/3666. Acesso em: 3 oct. 2025.