Агранович, Ю. Я., and Н. В. Концевая. “Method for Determining the Parameters of Smoothing Time Series Based on Minimizng the Discrepancy in the Euler-Maclaurin Formula”. Modern Economics: Problems and Solutions, Vol. 7, Apr. 2015, pp. 131-8, https://journals.vsu.ru/meps/article/view/4774.