Babenko VV, Rudenko AA. Optimization of quadratures on classes of functions given by differential operators with Real Spectra. Ukr. Mat. Zhurn. [Internet]. 1996 Mar. 25 [cited 2025 Apr. 16];48(3):291-300. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/5326