@article{MS2_1953__1_165494,
     author = {Arne BEURLING},
     title = {A theorem on functions defined on a semi-group},
     journal = {Mathematica Scandinavica},
     pages = {127--130},
     year = {1953},
     volume = {1},
     zbl = {0050.33701},
     url = {http://geodesic.mathdoc.fr/item/MS2_1953__1_165494/}
}