Leonenko, N. N., and M. M. Sharapov. “Gaussian and Non-Gaussian Limit Distributions of Estimates of the Regression Coefficients of a Long-Memory Time Series”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 51, no. 7, July 1999, pp. 931–939, https://umj.imath.kiev.ua/index.php/umj/article/view/4682.