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\usepackage {pstricks,pst-node}
\begin{psmatrix}
 A                        & B \\
 $\sqrt{\frac{x + y}{z}}$ & D
 \ncline{1,1}{1,2}
 \ncline{1,2}{2,2}
 \ncline{2,2}{2,1}
 \ncline{2,1}{1,1}
\end{psmatrix}