@article{CMUC_1997__38_1_a2,
     author = {Kilpel\"ainen, T.},
     title = {Smooth approximation in weighted {Sobolev} spaces},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {29--35},
     publisher = {mathdoc},
     volume = {38},
     number = {1},
     year = {1997},
     mrnumber = {1455468},
     zbl = {0886.46035},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1997__38_1_a2/}
}