BABENKO, V. V.; RUDENKO, A. A. Optimization of quadratures on classes of functions given by differential operators with Real Spectra. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 48, n. 3, p. 291–300, 1996. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5326. Acesso em: 17 apr. 2025.