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* <nowiki>[1]</nowiki> [http://www.cs.unc.edu/techreports/89-034.pdf A Node-Positioning Algorihm for General Trees. John Q.Walker II]
* <nowiki>[2]</nowiki> [http://dirk.jivas.de/papers/buchheim02improving.pdf Improving Walker's Algorithm to Run in Linear Time. Christoph Buchheim et.al.]
* [https://github.com/gramps-project/gramps/pull/548 Add Buchheim tree ancestor trees to Narrated Web Report #548]
==See also==