Ashim Garg Adrian Rusu A More Practical Algorithm for Drawing Binary Trees in Linear Area with Arbitrary Aspect Ratio. 159-165 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2912&spage=159 2003 conf/gd/2003 Graph Drawing db/conf/gd/gd2003.html#GargR03a