@article{MAN_1870__2_156442,
     author = {Heine},
     title = {Aus brieflichen {Mittheilungen} (namentlich \"uber {Variationsrechnung).}},
     journal = {Mathematische Annalen},
     pages = {187--191},
     year = {1870},
     volume = {2},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MAN_1870__2_156442/}
}