@article{JRAM_1976__281_151685,
     author = {A. Schneider and H.D. Niessen},
     title = {Linksdefinite singul\"are kanonische {Eigenwertprobleme.} {I.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {13--52},
     year = {1976},
     volume = {281},
     zbl = {0288.34016},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1976__281_151685/}
}