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@article{MM2_1995__87_4_156081, author = {H.-Q. Liu}, title = {Lower {Bounds} for {Sums} of {Barban-Davenport-Halberstam} {Type} (supplement).}, journal = {Manuscripta mathematica}, pages = {159--166}, publisher = {mathdoc}, volume = {87}, number = {4}, year = {1995}, zbl = {0834.11036}, url = {http://geodesic.mathdoc.fr/item/MM2_1995__87_4_156081/} }
H.-Q. Liu. Lower Bounds for Sums of Barban-Davenport-Halberstam Type (supplement).. Manuscripta mathematica, Tome 87 (1995) no. 4, pp. 159-166. http://geodesic.mathdoc.fr/item/MM2_1995__87_4_156081/