@article{atractableellipsoidalapproximationfor,
  title = {A tractable ellipsoidal approximation for voltage regulation problems},
  author = {Pan Li and Baihong Jin and Ruoxuan Xiong and Dai Wang and Alberto Sangiovanni-Vincentelli and Baosen Zhang},
  year = {2019},
  eprint = {1903.03763},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1903.03763v1},
}