@article{AV_1938__7_2_a3,
     author = {Steffensen, J. F.},
     title = {More multiplicity},
     journal = {Aktu\'arsk\'e v\v{e}dy},
     pages = {71--72},
     publisher = {mathdoc},
     volume = {07},
     number = {2},
     year = {1938},
     zbl = {0018.32307},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AV_1938__7_2_a3/}
}