@CONFERENCE\{IMM2005-04451, author = "P. Bille and I. L. G{\o}rtz", title = "The Tree Inclusion Problem: In Optimal Space and Faster", year = "2005", month = "jul", pages = "66-77", booktitle = "Proc. 32nd International Colloquium on Automata, Languages and Programming ({ICALP} 2005). Lecture Notes in Computer Science", volume = "3580", series = "", editor = "", publisher = "Springer-Verlag", organization = "", address = "", url = "http://www2.compute.dtu.dk/pubdb/pubs/4451-full.html" }