Pengwei Wang 0001 Yi Wei Zhaohui Zhang 0001 Optimizing Data Placement in Multi-cloud Environments Considering Data Temperature. 167-179 2021 ICAIS (2) https://doi.org/10.1007/978-3-030-78612-0_14 conf/icccsec/2021-2 db/conf/icccsec/icais2021-2.html#WangWZ21