#' @references
#'
#' M. N. Berberan-Santos. "Expressing a Probability Density Function in Terms of another
#' PDF: A Generalized Gram-Charlier Expansion." Journal of Mathematical
#' Chemistry 42, no 3 (2007): 585-594.
#' \url{http://web.ist.utl.pt/ist12219/data/115.pdf}
#'
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