D. Arabidze, P. Babilua, E. Nadaraya, and G. A. Sokhadze, “Integral Functionals of the Gasser–Muller Regression Function”, Ukr. Mat. Zhurn., vol. 67, no. 4, pp. 435–446, Apr. 2015, Accessed: Dec. 06, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/1994