#' @references
#'
#' **Assessment Design:**
#'
#' - PISA Test Overview: <https://www.oecd.org/pisa/aboutpisa/>
#' - PISA 2012 Mathematics Items:
#' <https://www.oecd.org/pisa/test/PISA%202012%20items%20for%20release_ENGLISH.pdf>
#'
#' **Data used in:**
#'
#' - Culpepper, S. A., & Balamuta, J. J. (2021).
#' Inferring latent structure in polytomous data with a higher-order diagnostic model.
#' Multivariate Behavioral Research, 1–19. \doi{10.1080/00273171.2021.1985949}
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