Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MS2_1955__3_165580, author = {ARNE BEURLING}, title = {Problem 12}, journal = {Mathematica Scandinavica}, pages = {171--171}, publisher = {mathdoc}, volume = {3}, year = {1955}, zbl = {0065.30303}, url = {http://geodesic.mathdoc.fr/item/MS2_1955__3_165580/} }
ARNE BEURLING. Problem 12. Mathematica Scandinavica, Tome 3 (1955), p. 171. http://geodesic.mathdoc.fr/item/MS2_1955__3_165580/