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reference. Aδ: Autodiff for discontinuous programs-applied to shaders [yang2022delta]

@article{yang2022delta,
 title = {A $\delta$: autodiff for discontinuous programs-applied to shaders},
 author = {Yang, Yuting and Barnes, Connelly and Adams, Andrew and Finkelstein, Adam},
 year = {2022},
 journal = {ACM Transactions on Graphics (TOG)},
 volume = {41},
 number = {4},
 pages = {1--24},
 publisher = {ACM New York, NY, USA}
}