Aseev, V., A. Sychev, and A. V. Tetenov. “Gluing of Quasisymmetric Imbeddings in the Problem of Quasiconformal Extension”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 56, no. 6, June 2004, pp. 737–744, https://umj.imath.kiev.ua/index.php/umj/article/view/3794.