@article{NGWGMP_1902__1902_58511,
     author = {Lothar Heffter},
     title = {Zur {Theorie} der reellen {Curvenintegrale}},
     journal = {Nachrichten von der Gesellschaft der Wissenschaften zu G\"ottingen, Mathematisch-Physikalische Klasse},
     pages = {115--140},
     publisher = {mathdoc},
     volume = {1902},
     year = {1902},
     zbl = {33.0310.02},
     url = {http://geodesic.mathdoc.fr/item/NGWGMP_1902__1902_58511/}
}