Two trees which are self-intersecting when drawn simultaneously
Markus Geyer,
Michael Kaufmann,
and Imrich Vrt'o
Proc. 13th Int. Symp. Graph Drawing (GD 2005), Lecture Notes in Computer Science 3843, Patrick Healy
and Nikola S. Nikolov, ed., Springer-Verlag, 2005, pp. 201–210
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