@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/}
}