BazaliiB. V. “Stefan Problem for the Laplace Equation With Regard for the Curvature of the Free Boundary”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 49, no. 10, Oct. 1997, pp. 1299–1315, https://umj.imath.kiev.ua/index.php/umj/article/view/5128.