@article{MZM_2011_90_5_a1,
     author = {V. I. Astakhov},
     title = {Additivity of the {Space} of {Densities} of {Simple-Layer} {Potentials} with a {Finite} {Dirichlet} {Integral} and {Integrability} of {Normal} {Derivatives} of {Harmonic} $W_2^1${-Functions} on {Lipschitz} {Surfaces}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {659--664},
     publisher = {mathdoc},
     volume = {90},
     number = {5},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2011_90_5_a1/}
}