@inproceedings{
    eerolacompstat,
    author = "Eerola, M. and Mannila, Heikki and Salmenkivi, M.",
    booktitle = "COMPSTAT'98, Conference of the International Association for Statistical Computing",
    year = "1998",
    editors = "R. Payne and P. Green",
    title = "Frailty factors and time-dependent hazards in modelling ear infections"
}