References
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.. [WPV2004] Walley, P., Pelessoni, R., and Vicig, P. (2004).
      Direct algorithms for checking consistency and making inferences from conditional probability assessments.
      *Journal of Statistical Planning and Inference*, 126(1):119-151.
      `doi:10.1016/j.jspi.2003.09.005 <http://dx.doi.org/10.1016/j.jspi.2003.09.005>`_