@article{
    bela,
    author = "Bollobas, B. and Das, G. and Gunopulos, D. and Mannila, H.",
    title = "Time-series similarity problems and well-separated geometric sets",
    journal = "Nordic Journal on Computing",
    number = "4",
    volume = "8",
    year = "2001",
    pages = "409-423"
}