KukushA. G., TsaregorodtsevY. V., and ShklyarS. V. “Asymptotically Independent Estimators in a structural Linear Model With Measurement Errors”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 68, no. 11, Nov. 2016, pp. 1505-17, https://umj.imath.kiev.ua/index.php/umj/article/view/1937.