@ARTICLE{9497652,
  author={Lin, Michael and Martins, Nuno C. and La, Richard J.},
  journal={IEEE Transactions on Control of Network Systems}, 
  title={Queueing Subject to Activity-Dependent Server Performance: Task-Assignment Control Policies for Utilization Rate Reduction}, 
  year={2022},
  volume={9},
  number={1},
  pages={257-268},
  doi={10.1109/TCNS.2021.3100406}}