@article{MS2_1994__74_1_167284,
     author = {Anders, Maz'ya, V. Carlsson},
     title = {On {Approximation} in {Weighted} {Sobolev} {Spaces} and {Self-Adjointness.}},
     journal = {Mathematica Scandinavica},
     pages = {111--124},
     publisher = {mathdoc},
     volume = {74},
     number = {1},
     year = {1994},
     zbl = {0824.46035},
     url = {http://geodesic.mathdoc.fr/item/MS2_1994__74_1_167284/}
}