@article{NUMA_1969__13_131917,
     author = {J. NITSCHE},
     title = {Verfahren von {Ritz} und {Spline-Interpolation} bei {Sturm-Liouville-Randwertproblemen.}},
     journal = {Numerische Mathematik},
     pages = {260--265},
     publisher = {mathdoc},
     volume = {13},
     year = {1969},
     zbl = {0181.18204},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1969__13_131917/}
}