@article{JRAM_1913__142_149398,
     author = {Konrad Knopp},
     title = {\"Uber {Lambertsche} {Reihen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {283--315},
     publisher = {mathdoc},
     volume = {142},
     year = {1913},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1913__142_149398/}
}