@article{1077471938,
author = {Helsel, R. G. and Young, P. M.},
title = {Characterization theorems for integral means},
journal = {Duke Math. J.},
volume = {10},
number = {1},
year = {1943},
pages = { 259-269},
language = {en},
url = {http://dml.mathdoc.fr/item/1077471938}
}
Helsel, R. G.; Young, P. M. Characterization theorems for integral means. Duke Math. J., Tome 10 (1943) no. 1, pp. 259-269. http://gdmltest.u-ga.fr/item/1077471938/