@ARTICLE{26lxx-tmc,
  author = {Haiyun Liu and Jiahao Xue and Jie Xu and Yao Liu and Zhuo Lu},
  title = {Hybrid Hierarchical Federated Learning over 5G/{NextG} Wireless Networking},
  journal = {IEEE Transactions on Mobile Computing},
  volume = {},
  number = {},
  pages = {},
  month = {}
  year = {To Appear}
}