@inproceedings{
    kup:prz:02,
    author = "Kupść, Anna and Przepiórkowski, Adam",
    url = "http://nlp.ipipan.waw.pl/~adamp/Papers/1997-fdsl2-ak/",
    title = "Morphological Aspects of Verbal Negation in {P}olish",
    pages = "337--346",
    crossref = "kos:fra:02:ed"
}
@proceedings{
    kos:fra:02:ed,
    editor = "Kosta, Peter and Frasek, Jens",
    publisher = "Peter Lang",
    booktitle = "Current Approaches to Formal {S}lavic Linguistics: Proceedings of the Second {E}uropean Conference on Formal Description of {S}lavic Languages, {P}otsdam, 1997",
    address = "Frankfurt am Main",
    title = "Current Approaches to Formal {S}lavic Linguistics: Proceedings of the Second {E}uropean Conference on Formal Description of {S}lavic Languages, {P}otsdam, 1997",
    year = "2002"
}