Jianfeng Lu 0002 Zheng Wang 0061 Dewu Xu Changbing Tang Jianmin Han Towards an Efficient Approximate Solution for the Weighted User Authorization Query Problem. 1762-1769 2017 100-D IEICE Trans. Inf. Syst. 8 https://doi.org/10.1587/transinf.2016ICP0002 http://search.ieice.org/bin/summary.php?id=e100-d_8_1762 db/journals/ieicet/ieicet100d.html#LuWXTH17