@inproceedings{Blum:1967:AT:1674645.1675318,
    Address = {Washington, DC, USA},
    Author = {Blum, M. and Hewitt, C.},
    BookTitle = {Proceedings of the 8th Annual Symposium on Switching and Automata Theory (SWAT 1967)},
    File = {Automata on a 2-dimensional Tape - Blum, Hewitt (0) (0) - a - a - t.pdf},
    Pages = {155--160},
    Publisher = {IEEE Computer Society},
    Series = {FOCS '67},
    Title = {Automata on a 2-dimensional Tape},
    URL = {http://dx.doi.org/10.1109/FOCS.1967.6},
    Year = {1967},
    acmid = {1675318},
    bdsk-url-1 = {http://dx.doi.org/10.1109/FOCS.1967.6},
    date-added = {2015-04-23 19:24:01 +0000},
    date-modified = {2015-04-23 19:24:01 +0000},
    numpages = {6},
    doi = {10.1109/FOCS.1967.6}
}

@inproceedings{Blum:1967:AT:1674645.1675318, Address = {Washington, DC, USA}, Author = {Blum, M. and Hewitt, C.}, BookTitle = {Proceedings of the 8th Annual Symposium on Switching and Automata Theory (SWAT 1967)}, File = {Automata on a 2-dimensional Tape - Blum, Hewitt (0) (0) - a - a - t.pdf}, Pages = {155--160}, Publisher = {IEEE Computer Society}, Series = {FOCS '67}, Title = {Automata on a 2-dimensional Tape}, URL = {http://dx.doi.org/10.1109/FOCS.1967.6}, Year = {1967}, acmid = {1675318}, bdsk-url-1 = {http://dx.doi.org/10.1109/FOCS.1967.6}, date-added = {2015-04-23 19:24:01 +0000}, date-modified = {2015-04-23 19:24:01 +0000}, numpages = {6}, doi = {10.1109/FOCS.1967.6} }