@article{bayesianoptimizationwithdirectionally,
  title = {Bayesian Optimization with Directionally Constrained Search},
  author = {Yang Li and Yaqiang Yao},
  year = {2019},
  eprint = {1906.09459},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/1906.09459v1},
}