@article{MZ_1987__196_173879,
     author = {Franz Peherstorfer and Andr\'as Kro\'o},
     title = {Interpolatory {Properties} of {Best} {L1-approximants.}},
     journal = {Mathematische Zeitschrift},
     pages = {249--258},
     year = {1987},
     volume = {196},
     zbl = {0635.41004},
     url = {http://geodesic.mathdoc.fr/item/MZ_1987__196_173879/}
}