@article{MZ_1985__189_173572,
     author = {W. Hau{\ss}mann and K. Jetter and B. Steinhaus},
     title = {Degree of {Best} {Approximation} by {Trigonometric} {Blending} {Functions.}},
     journal = {Mathematische Zeitschrift},
     pages = {143--150},
     publisher = {mathdoc},
     volume = {189},
     year = {1985},
     zbl = {0547.41011},
     url = {http://geodesic.mathdoc.fr/item/MZ_1985__189_173572/}
}