@article{JRAM_1902__124_149130,
     author = {M. Hamburger},
     title = {Ueber die {Umformung} von geschlossenen {Integralen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {28--37},
     year = {1902},
     volume = {124},
     zbl = {32.0309.01},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1902__124_149130/}
}