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@article{JRAM_1993__438_153518, author = {H.-Q. Liu}, title = {Lower bounds for sums of {Barban-Davenport-Halberstam} type.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {163--174}, publisher = {mathdoc}, volume = {438}, year = {1993}, zbl = {0776.11056}, url = {http://geodesic.mathdoc.fr/item/JRAM_1993__438_153518/} }
H.-Q. Liu. Lower bounds for sums of Barban-Davenport-Halberstam type.. Journal für die reine und angewandte Mathematik, Tome 438 (1993), pp. 163-174. http://geodesic.mathdoc.fr/item/JRAM_1993__438_153518/