@inproceedings{
    kilpmancpm,
    author = {Kilpel{\"a}inen, P. and Mannila, Heikki},
    pages = "213-225",
    booktitle = "Proceedings of the 1994 Symposium on Combinatorial Pattern Matching",
    year = "1994",
    editors = "M. Crochemore, D. Gusfield",
    title = "Query primitives for tree-structured data"
}