@article{MAN_1889__33_157404,
     author = {Heun},
     title = {Beitr\"age zur {Theorie} der {Lame'schen} {Functionen.}},
     journal = {Mathematische Annalen},
     pages = {180--196},
     publisher = {mathdoc},
     volume = {33},
     year = {1889},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MAN_1889__33_157404/}
}