@article{JRAM_1940__182_150082,
     author = {G. N\"obeling and Otto Haupt and C. Pauc},
     title = {Sekanten und {Paratingenten} in topologischen {Abh\"angigkeitsr\"aumen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {105--121},
     publisher = {mathdoc},
     volume = {182},
     year = {1940},
     zbl = {0023.17601},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1940__182_150082/}
}