#' @references
#'
#' Podani J (2000) "Ordination". _Introduction to the Exploration of
#' Multivariate Biological Data_ Chapter 7, 215--284. Backhuys Publishers, ISBN
#' 90-5782-067-6.
#' <https://web.archive.org/web/20200221000313/http://ramet.elte.hu/~podani/books.html>
#'
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