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This work was supported by National Science and Technology Major Project of China (Grant No. 2017ZX03001008), National Natural Science Foundation of China (Grant No. 61401218), Postdoctoral Research Plan of Jiangsu Province (Grant No. 1701167B), and Postdoctoral Science Foundation of China (Grant No. 2017M621795).
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Xu, D., Li, Q. Resource allocation in cognitive wireless powered communication networks with wirelessly powered secondary users and primary users. Sci. China Inf. Sci. 62, 29303 (2019). https://doi.org/10.1007/s11432-017-9387-5