@article{
    amn97,
    author = "Ahonen, H. and Mannila, H. and Nikunen, E.",
    title = "Generating grammars for SGML tagged texts lacking DTD",
    journal = "Mathematical and Computer Modelling",
    number = "1",
    volume = "26",
    year = "1997",
    pages = "1-13"
}