@INPROCEEDINGS( PSC2011-6, 
 author = "Martin Berglund",
 title = "Analyzing Edit Distance on Trees: Tree Swap Distance is Intractable",
 booktitle = "Proceedings of the Prague Stringology Conference 2011",
 address = "Czech Technical University in Prague, Czech Republic",
 editor = "Jan Holub and Jan {\v{Z}}{\v{d}}{\'{a}}rek",
 isbn = "978-80-01-04870-2",
 year = 2011,
 pages = "59--72",
)