@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/