@article{NUMA_1969__13_131924,
     author = {J. NITSCHE},
     title = {Interpolation in {Sobolevschen} {Funktionenr\"aumen.}},
     journal = {Numerische Mathematik},
     pages = {334--343},
     publisher = {mathdoc},
     volume = {13},
     year = {1969},
     zbl = {0221.65012},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1969__13_131924/}
}