#' @references
#' Lord, F. M. (1952). A theory of test scores (Psychometric Monograph No. 7). Richmond, VA: Psychometric Corporation.
#'
#' Birnbaum, A. (1957). \emph{Efficient design and use of tests of mental ability for various decision-making problems}
#' (Series Report No. 58-16. Project No. 7755-23).
#' Randolph Air Force Base, TX: USAF School of Aviation Medicine.
#'
#' Birnbaum, A. (1958). \emph{On the estimation of mental ability}
#' (Series Report No. 15. Project No. 7755-23).
#' Randolph Air Force Base, TX: USAF School of Aviation Medicine.
#'
#' Birnbaum, A. (1958). \emph{Further considerations of efficiency in tests of a mental ability}
#' (Series Report No. 17. Project No. 7755-23).
#' Randolph Air Force Base, TX: USAF School of Aviation Medicine.
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