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* OR and ECD review by Pecul and Ruud \cite{Pecul_2005}  * Berova's book \cite{Berova_2011}  * Daniel's reviews \cite{Crawford_2005}, \cite{Crawford_2007}, \cite{Crawford_2012}  * Octant rule \cite{Snatzke_1979} and its failure \cite{Rinderspacher_2004}  Objectives of the project: