BaranovskyiO. M., PratsiovytyiM. V., and TorbinH. M. “Topological and Metric Properties of Sets of Real Numbers With Conditions on Their Expansions in Ostrogradskii Series”. Ukrains’kyi Matematychnyi Zhurnal 59, no. 9 (September 25, 2007): 1155–1168. Accessed July 27, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3379.