@article{MZ_1936__40_168632,
     author = {L. Heffter},
     title = {Kurven- und {Stieltjes-Integral}},
     journal = {Mathematische Zeitschrift},
     pages = {608--612},
     publisher = {mathdoc},
     volume = {40},
     year = {1936},
     zbl = {0012.25204},
     url = {http://geodesic.mathdoc.fr/item/MZ_1936__40_168632/}
}