#' @references
#'
#' Gardner S & le Roux NJ (2005) "Extensions of Biplot Methodology to
#' Discriminant Analysis". _Journal of Classification_ **22**(1): 59--86.
#' \doi{10.1007/s00357-005-0006-7}
#' <https://link.springer.com/article/10.1007/s00357-005-0006-7>
#'
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