@article{GDZPPN002439751, title = {Two elementary proofs of Hal\'asz's theorem.}, journal = {Mathematische Zeitschrift}, volume = {209}, year = {1992}, pages = {43-52}, zbl = {0724.11045}, url = {http://dml.mathdoc.fr/item/GDZPPN002439751} }
Indlekofer, Karl-Heinz; Daboussi, Hédi. Two elementary proofs of Halász's theorem.. Mathematische Zeitschrift, Tome 209 (1992) pp. 43-52. http://gdmltest.u-ga.fr/item/GDZPPN002439751/