@article{
    mrjcss,
    author = {Mannila, Heikki and R{\"a}ih{\"a}, K.-J.},
    title = "Automatic generation of test data for relational queries",
    journal = "Journal of Computer and System Sciences",
    number = "2",
    volume = "38",
    year = "1989",
    pages = "240-258"
}