@ARTICLE{23lqt-tcyb,
  author = {Xingyu Li and Zhe Qu and Bo Tang and Zhuo Lu},
  title = {{FedLGA}: Towards System-Heterogeneity of Federated Learning via Local Gradient Approximation},
  journal = {IEEE Transactions on Cybernetics},
  volume = {},
  number = {},
  pages = {},
  year = {To Appear}
}