VestfridI. A. “$\varepsilon$-Isometries of Convex Bodies in $l^n_\infty$ and $l^n_1$”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 76, no. 9, Sept. 2024, pp. 1419 -23, doi:10.3842/umzh.v76i9.8295.