@article{MAN_1954__127_160379,
     author = {J.W.S. Cassels},
     title = {\"Uber lim x... x + a - y.},
     journal = {Mathematische Annalen},
     pages = {288--304},
     publisher = {mathdoc},
     volume = {127},
     year = {1954},
     url = {http://geodesic.mathdoc.fr/item/MAN_1954__127_160379/}
}