SHVAI, A. I.; ANTONYUK, P. E.; DZYADYK, S. Yu.; ZARITSKAYA, Z. V. Approximation of the $| x |^r$ function and its derivatives. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 42, n. 6, p. 821–826, 1990. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8845. Acesso em: 6 dec. 2025.