@article{Ritchie:1974:UTS:361011.361061,
    Address = {New York, NY, USA},
    Author = {Ritchie, Dennis M. and Thompson, Ken},
    File = {The UNIX Time-sharing System - Ritchie, Thompson (0) (0) - a - a - l.pdf},
    ISSN = {0001-0782},
    Journal = {Commun. ACM},
    Keywords = {PDP-11, command language, file system, operating system, time-sharing},
    Month = {July},
    Number = {7},
    Pages = {365--375},
    Publisher = {ACM},
    Title = {The UNIX Time-sharing System},
    URL = {http://doi.acm.org/10.1145/361011.361061},
    Volume = {17},
    Year = {1974},
    acmid = {361061},
    bdsk-url-1 = {http://doi.acm.org/10.1145/361011.361061},
    bdsk-url-2 = {http://dx.doi.org/10.1145/361011.361061},
    date-added = {2014-05-06 11:23:39 +0000},
    date-modified = {2014-05-06 11:23:39 +0000},
    issue_date = {July 1974},
    numpages = {11},
    doi = {10.1145/361011.361061}
}

@article{Ritchie:1974:UTS:361011.361061, Address = {New York, NY, USA}, Author = {Ritchie, Dennis M. and Thompson, Ken}, File = {The UNIX Time-sharing System - Ritchie, Thompson (0) (0) - a - a - l.pdf}, ISSN = {0001-0782}, Journal = {Commun. ACM}, Keywords = {PDP-11, command language, file system, operating system, time-sharing}, Month = {July}, Number = {7}, Pages = {365--375}, Publisher = {ACM}, Title = {The UNIX Time-sharing System}, URL = {http://doi.acm.org/10.1145/361011.361061}, Volume = {17}, Year = {1974}, acmid = {361061}, bdsk-url-1 = {http://doi.acm.org/10.1145/361011.361061}, bdsk-url-2 = {http://dx.doi.org/10.1145/361011.361061}, date-added = {2014-05-06 11:23:39 +0000}, date-modified = {2014-05-06 11:23:39 +0000}, issue_date = {July 1974}, numpages = {11}, doi = {10.1145/361011.361061} }