@article{JRAM_1840__20_147087,
     author = {Hermann Haedenkamp},
     title = {De transformatione integralis ... .},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {97--100},
     publisher = {mathdoc},
     volume = {20},
     year = {1840},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1840__20_147087/}
}