@article{JRAM_1889__104_148741,
     author = {L. Pochhammer},
     title = {Ueber drei lineare {Differentialgleichungen} vierter {Ordnung.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {116--151},
     year = {1889},
     volume = {104},
     zbl = {20.0350.01},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1889__104_148741/}
}