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@Article{Walker:1991:PNG, author = "John Q. {Walker II}", title = "Positioning Nodes For General Trees", journal = j-CUJ, volume = "9", number = "2", pages = "47--62", month = feb, year = "1991", ISSN = "0898-9788", bibdate = "Mon Nov 11 12:28:48 1996", bibsource = "http://www.cuj.com/cbklist.htm; http://www.math.utah.edu/pub/tex/bib/cccuj.bib", acknowledgement = ack-nhfb, }