@article{GDZPPN002542412,
title = {A problem of theodore S. Motzkin on the arithmetic mean},
journal = {Seminaire de Th\'eorie des Nombres de Bordeaux},
volume = {1},
year = {1971},
pages = {1-6},
zbl = {0272.10017},
url = {http://dml.mathdoc.fr/item/GDZPPN002542412}
}
ROTHSCHILD, Bruce. A problem of theodore S. Motzkin on the arithmetic mean. Seminaire de Théorie des Nombres de Bordeaux, Tome 1 (1971) pp. 1-6. http://gdmltest.u-ga.fr/item/GDZPPN002542412/