@incollection{
    lexa,
    editor = {Husberg, Nisse and Janhunen, Tomi and Niemel{\"{a}}, Ilkka},
    author = "Lassila, Eero",
    publisher = "Helsinki University of Technology, Laboratory for Theoretical Computer Science",
    title = "On Tree Belts and Belt-Selectors",
    booktitle = "Lexa Notes in Computer Science: Festschrift in Honour of Professor {L}eo {O}jala",
    month = "October",
    groups = "GROUP_1 group_2",
    year = "2000",
    pages = "47--58"
}