Trees, using pstricks.
pst-tree is a pstricks package that defines a macro \pstree which offers a structured way of joining nodes created using pst-node in order to draw trees.
The authors are Herbert Voß, Denis Girou and Timothy Van Zandt. The package is Copyright © 2004 Herbert Voss.
License: lppl Catalogued: 2006-06-04
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Documentation
Read documentation for this package from: http://www.essex.ac.uk/linguistics/clmt/latex4ling/trees/pstrees/index.pdf.