@article{GDZPPN002343452, title = {Problem 10}, journal = {Mathematica Scandinavica}, volume = {2}, year = {1954}, pages = {346-346}, url = {http://dml.mathdoc.fr/item/GDZPPN002343452} }
POULSEN, E.THUE. Problem 10. Mathematica Scandinavica, Tome 2 (1954) p. 346. http://gdmltest.u-ga.fr/item/GDZPPN002343452/