Kirillov, K.A. “On Error Estimates for Quadrature Formulas Exact for Haar Polynomials”. Numerical Methods and Programming (Vychislitel’nye Metody i Programmirovanie) 12, no. 29 (September 12, 2011): 330–337. Accessed April 29, 2024. https://en.num-meth.ru/index.php/journal/article/view/467.