@article{MZM_2005_77_3_a4,
     author = {P. A. Krutitskii and A. I. Sgibnev},
     title = {On the singularities of the gradient of the solution to the {Dirichlet{\textendash}Neumann} problem outside a~plane cut},
     journal = {Matemati\v{c}eskie zametki},
     pages = {364--377},
     year = {2005},
     volume = {77},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2005_77_3_a4/}
}