basis_Q312_2D.tex

This element is (as far as I know) not widely used. I have found it in 
\textcite{eriz68} (1968) - check the appendix of the paper too. 
In essence the internal nodes of the $Q_3$ are absent, 
which leaves 12 nodes (instead of 16).

\begin{center}
\includegraphics[width=4cm]{images/elements/Q3_12}
\end{center}