@article{JRAM_1970__244_151047,
     author = {F.W. Sch\"afke},
     title = {Integrationstheorie. {I.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {154--176},
     year = {1970},
     volume = {244},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1970__244_151047/}
}