@article{MAN_1970__187_162019,
     author = {G. FREI},
     title = {Beitr\"age zur axiomatischen {Inhaltstheorie.}},
     journal = {Mathematische Annalen},
     pages = {220--240},
     publisher = {mathdoc},
     volume = {187},
     year = {1970},
     url = {http://geodesic.mathdoc.fr/item/MAN_1970__187_162019/}
}