BondarevB. V., and Kozyr’S. M. “Mixing ‘In the Sense of Ibragimov.’ Estimate for the Rate of Approach of a Family of Integral Functionals of a Solution of a Differential Equation With Periodic Coefficients to a Family of Wiener Processes. Some Applications. I”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 62, no. 6, June 2010, pp. 733–753, https://umj.imath.kiev.ua/index.php/umj/article/view/2905.