Krutitskii, P. A., & Krutitskaya, N. C. (2008). The harmonic Dirichlet problem in a planar domain with cracks. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, 7, 113–123. Retrieved from https://studmath.uken.krakow.pl/article/view/13273