@article{GDZPPN002343444,
title = {Problem 9},
journal = {Mathematica Scandinavica},
volume = {2},
year = {1954},
pages = {345-345},
url = {http://dml.mathdoc.fr/item/GDZPPN002343444}
}
CHUNG, K.L. Problem 9. Mathematica Scandinavica, Tome 2 (1954) p. 345. http://gdmltest.u-ga.fr/item/GDZPPN002343444/