Babenko, V. F., Kofanov, V. A. and Pichugov, S. A. (2004) “Approximation of sine-shaped functions by constants in the spaces $L_p,\; p < 1$”, Ukrains’kyi Matematychnyi Zhurnal, 56(6), pp. 745–762. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3795 (Accessed: 17May2024).