BEL'SKII, S. A. On Piecewise-Constant Approximation of Continuous Functions of n Variables in Integral Metrics. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 54, n. 3, p. 293–303, 2002. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4066. Acesso em: 6 dec. 2025.