@misc{AGWG_1931__4_1931_135571,
     title = {[unknown]},
     journal = {Abhandlungen der Gesellschaft der Wissenschaften in G\"ottingen, Mathematisch-Physikalische Klasse},
     pages = {2--78},
     publisher = {mathdoc},
     volume = {4_1931},
     year = {1931},
     url = {http://geodesic.mathdoc.fr/item/AGWG_1931__4_1931_135571/}
}