Yin Xu 0004 Mingjun Xiao Jie Wu 0001 He Sun Privacy Preserving Task Push in Spatial Crowdsourcing With Unknown Popularity. 2039-2053 2024 November 35 IEEE Trans. Parallel Distributed Syst. 11 https://doi.org/10.1109/TPDS.2024.3434978 db/journals/tpds/tpds35.html#XuXWS24 streams/journals/tpds