@article{MAN_1921__83_158865,
     author = {K. Boehm},
     title = {Der {Unabh\"angigkeitssatz} f\"ur {Doppelintegrale}},
     journal = {Mathematische Annalen},
     pages = {149--156},
     year = {1921},
     volume = {83},
     zbl = {48.0588.02},
     url = {http://geodesic.mathdoc.fr/item/MAN_1921__83_158865/}
}