@article{JRAM_1892__110_148865,
     author = {E. Busche},
     title = {Ueber die {Formel} {E(x)} mit complexem {Argument.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {338--348},
     publisher = {mathdoc},
     volume = {110},
     year = {1892},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1892__110_148865/}
}