@article{crespo2021primary,
  title={Primary-Space Adaptive Control Variates using Piecewise-Polynomial Approximations},
  author={Crespo, Miguel and Jarabo, Adrian and Mu{\~n}oz, Adolfo},
  year={2021},
  journal = {ACM Transactions on Graphics},
  doi = {10.1145/3450627},
}