@unpublished{
    prze:98b,
    author = "Przepiórkowski, Adam",
    note = "Paper delivered at the Spring 1998 Meeting of the Linguistics Association of Great Britain, Lancaster, Great Britain, April 14–16 1998",
    url = "http://nlp.ipipan.waw.pl/~adamp/Papers/1998-lagb/",
    title = "{\em Do So} and Lexical Theories of Passivization",
    year = "1998"
}