Arabidze, D., P. Babilua, E. Nadaraya, and G. A. Sokhadze. 2015. “Integral Functionals of the Gasser–Muller Regression Function”. Ukrains’kyi Matematychnyi Zhurnal 67 (4), 435-46. https://umj.imath.kiev.ua/index.php/umj/article/view/1994.