[1]
T. A. Agoshkova, “Approximation of Periodic Functions of Many Variables in Metric Spaces by Piecewise-Constant Functions”, Ukr. Mat. Zhurn., vol. 65, no. 10, pp. 1303–1314, Oct. 2013, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/2510