@incollection{vardi:twoway:98,
    Author = {Vardi, MosheY.},
    BookTitle = {Automata, Languages and Programming},
    Editor = {Larsen, KimG. and Skyum, Sven and Winskel, Glynn},
    File = {Reasoning about the past with two-way automata - Vardi (0) (0) - a - a - j.pdf},
    ISBN = {978-3-540-64781-2},
    Keywords = {two-way automata and tree automata},
    Pages = {628-641},
    Publisher = {Springer Berlin Heidelberg},
    Series = {Lecture Notes in Computer Science},
    Title = {Reasoning about the past with two-way automata},
    URL = {http://dx.doi.org/10.1007/BFb0055090},
    Volume = {1443},
    Year = {1998},
    bdsk-url-1 = {http://dx.doi.org/10.1007/BFb0055090},
    date-added = {2013-07-22 16:29:52 +0000},
    date-modified = {2013-07-22 16:30:47 +0000},
    doi = {10.1007/BFb0055090}
}

@incollection{vardi:twoway:98, Author = {Vardi, MosheY.}, BookTitle = {Automata, Languages and Programming}, Editor = {Larsen, KimG. and Skyum, Sven and Winskel, Glynn}, File = {Reasoning about the past with two-way automata - Vardi (0) (0) - a - a - j.pdf}, ISBN = {978-3-540-64781-2}, Keywords = {two-way automata and tree automata}, Pages = {628-641}, Publisher = {Springer Berlin Heidelberg}, Series = {Lecture Notes in Computer Science}, Title = {Reasoning about the past with two-way automata}, URL = {http://dx.doi.org/10.1007/BFb0055090}, Volume = {1443}, Year = {1998}, bdsk-url-1 = {http://dx.doi.org/10.1007/BFb0055090}, date-added = {2013-07-22 16:29:52 +0000}, date-modified = {2013-07-22 16:30:47 +0000}, doi = {10.1007/BFb0055090} }