@inproceedings{Seidl04Counting, author = {Helmut Seidl and Thomas Schwentick and Anca Muscholl and Peter Habermehl}, title = {Counting in {T}rees for {F}ree}, booktitle = {Automata, Languages and Programming}, editor = {Josep D\'iaz and Juhani Karhum\"aki and Arto Lepist\"o and Donald Sannella}, month = {July}, year = 2004, pages = {1136-1149}, series = {Lecture Notes in Computer Science}, volume = {3142}, publisher = {Springer}, address = {Turku, Finland}, }