@article{crespo21primary,
	title = {Primary-Space Adaptive Control Variates using Piecewise-Polynomial Approximations.},
	year = {2021},
	journal = {ACM Transactions on Graphics},
	author = {Crespo, Miguel and Jarabo, Adrian and Mu\~{n}oz, Adolfo},
    volume = {40},
    number = {3},
    issn = {0730-0301},
    url = {https://doi.org/10.1145/3450627},
    doi = {10.1145/3450627},
    issue_date = {July 2021},
    month = jul,
    articleno = {25},
    numpages = {15},
    keywords = {adaptive quadrature, numerical integration, control variates, rendering, piecewise polynomial}
}