#' @references
#'
#' J Arvo (2001) Stratified Sampling of 2-Manifolds. _SIGRAPH 2001 (State of the
#' Art in Monte Carlo Ray Tracing for Realistic Image Synthesis)_, Course Notes,
#' Vol. 29. \url{https://www.cs.princeton.edu/courses/archive/fall04/cos526/papers/course29sig01.pdf}
#'
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