@article{adaptivityandoptimalityauniversal,
  title = {Adaptivity and Optimality: A Universal Algorithm for Online Convex Optimization},
  author = {Guanghui Wang and Shiyin Lu and Lijun Zhang},
  year = {2019},
  eprint = {1905.05917},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/1905.05917v1},
}