@ARTICLE{8894836, author={Li, Chengzhang and Li, Shaoran and Chen, Yongce and Hou, Y. Thomas and Lou, Wenjing}, journal={IEEE Transactions on Network Science and Engineering}, title={Minimizing Age of Information Under General Models for IoT Data Collection}, year={2020}, volume={7}, number={4}, pages={2256-2270}, doi={10.1109/TNSE.2019.2952764}}