@article{JRAM_1897__117_149008,
     author = {Paul G\"unther},
     title = {Zur {Theorie} der adjungirten {Differentialgleichung.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {168--168},
     publisher = {mathdoc},
     volume = {117},
     year = {1897},
     zbl = {27.0244.02},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1897__117_149008/}
}