VESTFRID, Igor A. $\varepsilon$-Isometries of convex bodies in $l^n_\infty$ and $l^n_1$. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 76, n. 9, p. 1419–1423, 2025. DOI: 10.3842/umzh.v76i9.8295. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8295. Acesso em: 16 dec. 2025.