@article{ETNA_2006__24__a1,
     author = {Portilla, Ana and Quintana, Yamilet and Rodriguez, Jose M. and Touris, Eva},
     title = {Weierstrass' theorem in weighted {Sobolev} spaces with $k$ derivatives: announcement of results},
     journal = {Electronic transactions on numerical analysis},
     pages = {103--107},
     publisher = {mathdoc},
     volume = {24},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ETNA_2006__24__a1/}
}