@article{whenaregoogledatausefultonowcastgdpan,
  title = {When are Google data useful to nowcast GDP? An approach via pre-selection and shrinkage},
  author = {Laurent Ferrara and Anna Simoni},
  year = {2020},
  eprint = {2007.00273},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2007.00273v3},
}