BanakhT. O., KutsakS. M., MaslyuchenkoV. K., and MaslyuchenkoO. V. 2004. “Direct and Inverse Problems of Baire Classification of Integrals Depending on a Parameter”. Ukrains’kyi Matematychnyi Zhurnal 56 (11), 1443-57. https://umj.imath.kiev.ua/index.php/umj/article/view/3857.