@article{ETNA_2006__25__a24,
     author = {Bal\'azs,  Katherine and Kilgore,  Theodore},
     title = {Weighted approximation of derivatives on the half-line},
     journal = {Electronic transactions on numerical analysis},
     pages = {121--128},
     year = {2006},
     volume = {25},
     zbl = {1107.41005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ETNA_2006__25__a24/}
}