@article{NUMA_1975__24_132349,
     author = {R.D. Grigorieff},
     title = {Diskrete {Approximation} von {Eigenwertproblemen.} {I.} {Qualitative} {Konvergenz.}},
     journal = {Numerische Mathematik},
     pages = {355--374},
     publisher = {mathdoc},
     volume = {24},
     year = {1975},
     zbl = {0391.65020},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1975__24_132349/}
}