@article{Rosen:1975:PEC:1739936.1740076,
    Address = {Orlando, FL, USA},
    Author = {Rosen, Barry K.},
    File = {Program equivalence and context-free grammars - Rosen (0) (0) - a - a - e.pdf},
    ISSN = {0022-0000},
    Journal = {J. Comput. Syst. Sci.},
    Keywords = {recursive schemes},
    Month = {December},
    Number = {3},
    Pages = {358--374},
    Publisher = {Academic Press, Inc.},
    Title = {Program equivalence and context-free grammars},
    URL = {http://dx.doi.org/10.1016/S0022-0000(75)80057-2},
    Volume = {11},
    Year = {1975},
    acmid = {1740076},
    bdsk-url-1 = {http://dx.doi.org/10.1016/S0022-0000(75)80057-2},
    date-added = {2012-10-16 09:24:12 +0000},
    date-modified = {2012-10-26 08:44:11 +0000},
    issue_date = {December, 1975},
    numpages = {17},
    doi = {10.1016/S0022-0000(75)80057-2}
}

@article{Rosen:1975:PEC:1739936.1740076, Address = {Orlando, FL, USA}, Author = {Rosen, Barry K.}, File = {Program equivalence and context-free grammars - Rosen (0) (0) - a - a - e.pdf}, ISSN = {0022-0000}, Journal = {J. Comput. Syst. Sci.}, Keywords = {recursive schemes}, Month = {December}, Number = {3}, Pages = {358--374}, Publisher = {Academic Press, Inc.}, Title = {Program equivalence and context-free grammars}, URL = {http://dx.doi.org/10.1016/S0022-0000(75)80057-2}, Volume = {11}, Year = {1975}, acmid = {1740076}, bdsk-url-1 = {http://dx.doi.org/10.1016/S0022-0000(75)80057-2}, date-added = {2012-10-16 09:24:12 +0000}, date-modified = {2012-10-26 08:44:11 +0000}, issue_date = {December, 1975}, numpages = {17}, doi = {10.1016/S0022-0000(75)80057-2} }