@inproceedings{AKL08,
    author      =   "B. Aminof and O. Kupferman and O. Lev",
    title       =   "On the Relative Succinctness of Nondeterministic
                  B\"uchi and co-B\"uchi Word Automata"  
    booktitle   =   lpar08,
    series      =   lncs,
    volume      =   "5330",
    pages       =   "183-197",
    publisher   =   springer,
    year        =   2008
}