@article{efficientsecondordershapeconstrained,
  title = {Efficient Second-Order Shape-Constrained Function Fitting},
  author = {David Durfee and Yu Gao and Anup B. Rao and Sebastian Wild},
  year = {2019},
  eprint = {1905.02149},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/1905.02149v2},
}