@incollection{aiken:94,
    Author = {Aiken, Alexander},
    BookTitle = {Principles and Practice of Constraint Programming},
    Editor = {Borning, Alan},
    File = {Set constraints Results, applications and future directions - Aiken (1) (0) - a - a - e.pdf},
    ISBN = {978-3-540-58601-2},
    Keywords = {set constraints and readme},
    Pages = {326-335},
    Publisher = {Springer Berlin Heidelberg},
    Series = {Lecture Notes in Computer Science},
    Title = {Set constraints: Results, applications and future directions},
    URL = {http://dx.doi.org/10.1007/3-540-58601-6\_110},
    Volume = {874},
    Year = {1994},
    bdsk-url-1 = {http://dx.doi.org/10.1007/3-540-58601-6\_110},
    date-added = {2013-07-01 14:06:13 +0000},
    date-modified = {2013-07-01 14:08:53 +0000},
    doi = {10.1007/3-540-58601-6_110}
}

@incollection{aiken:94, Author = {Aiken, Alexander}, BookTitle = {Principles and Practice of Constraint Programming}, Editor = {Borning, Alan}, File = {Set constraints Results, applications and future directions - Aiken (1) (0) - a - a - e.pdf}, ISBN = {978-3-540-58601-2}, Keywords = {set constraints and readme}, Pages = {326-335}, Publisher = {Springer Berlin Heidelberg}, Series = {Lecture Notes in Computer Science}, Title = {Set constraints: Results, applications and future directions}, URL = {http://dx.doi.org/10.1007/3-540-58601-6_110}, Volume = {874}, Year = {1994}, bdsk-url-1 = {http://dx.doi.org/10.1007/3-540-58601-6_110}, date-added = {2013-07-01 14:06:13 +0000}, date-modified = {2013-07-01 14:08:53 +0000}, doi = {10.1007/3-540-58601-6_110} }