@article{NUMA_1978__30_132543,
     author = {W. Forst},
     title = {Zur {Interpolation} und {Integration} differenzierbarer periodischer {Funktionen.}},
     journal = {Numerische Mathematik},
     pages = {137--148},
     publisher = {mathdoc},
     volume = {30},
     year = {1978},
     zbl = {0431.41033},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1978__30_132543/}
}