@article{Lange:2006:AHF:1182767.1182769,
    Address = {Duluth, MN, USA},
    Author = {Lange, Martin},
    File = {The Alternation Hierarchy in Fixpoint Logic with Chop is Strict Too - Lange (0) (0) - a - a - s.pdf},
    ISSN = {0890-5401},
    Journal = {Inf. Comput.},
    Keywords = {expressive power, games, modal logic},
    Month = {September},
    Number = {9},
    Pages = {1346--1367},
    Publisher = {Academic Press, Inc.},
    Title = {The Alternation Hierarchy in Fixpoint Logic with Chop is Strict Too},
    URL = {http://dx.doi.org/10.1016/j.ic.2006.05.001},
    Volume = {204},
    Year = {2006},
    acmid = {1182769},
    bdsk-url-1 = {http://dx.doi.org/10.1016/j.ic.2006.05.001},
    date-added = {2014-03-19 20:37:25 +0000},
    date-modified = {2014-03-19 20:37:25 +0000},
    issue_date = {September 2006},
    numpages = {22},
    doi = {10.1016/j.ic.2006.05.001}
}

@article{Lange:2006:AHF:1182767.1182769, Address = {Duluth, MN, USA}, Author = {Lange, Martin}, File = {The Alternation Hierarchy in Fixpoint Logic with Chop is Strict Too - Lange (0) (0) - a - a - s.pdf}, ISSN = {0890-5401}, Journal = {Inf. Comput.}, Keywords = {expressive power, games, modal logic}, Month = {September}, Number = {9}, Pages = {1346--1367}, Publisher = {Academic Press, Inc.}, Title = {The Alternation Hierarchy in Fixpoint Logic with Chop is Strict Too}, URL = {http://dx.doi.org/10.1016/j.ic.2006.05.001}, Volume = {204}, Year = {2006}, acmid = {1182769}, bdsk-url-1 = {http://dx.doi.org/10.1016/j.ic.2006.05.001}, date-added = {2014-03-19 20:37:25 +0000}, date-modified = {2014-03-19 20:37:25 +0000}, issue_date = {September 2006}, numpages = {22}, doi = {10.1016/j.ic.2006.05.001} }