BONDAREV, B. V.; 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, v. 62, n. 6, p. 733–753, 25 Jun. 2010.