@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/