@article{ETNA_2012__39__a22,
     author = {Rutka, Przemys{\l}aw and Smarzewski, Ryszard},
     title = {Extremal interpolatory problem of {Fej\'er} type for all classical weight functions},
     journal = {Electronic transactions on numerical analysis},
     pages = {46--59},
     publisher = {mathdoc},
     volume = {39},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ETNA_2012__39__a22/}
}