@article{Gischer:CACM:1981,
    Author = {Gischer, Jay},
    File = {Shuffle languages, Petri nets, and context-sensitive grammars - Gischer (0) (0) - a - a - t.pdf},
    Journal = {Communications of the ACM},
    Month = {September},
    Title = {Shuffle languages, Petri nets, and context-sensitive grammars},
    Year = {1981},
    bdsk-url-1 = {http://dx.doi.org/10.1145/358746.358767},
    date-added = {2017-01-10 15:03:19 +0000},
    date-modified = {2017-01-10 15:04:10 +0000},
    doi = {10.1145/358746.358767}
}

@article{Gischer:CACM:1981, Author = {Gischer, Jay}, File = {Shuffle languages, Petri nets, and context-sensitive grammars - Gischer (0) (0) - a - a - t.pdf}, Journal = {Communications of the ACM}, Month = {September}, Title = {Shuffle languages, Petri nets, and context-sensitive grammars}, Year = {1981}, bdsk-url-1 = {http://dx.doi.org/10.1145/358746.358767}, date-added = {2017-01-10 15:03:19 +0000}, date-modified = {2017-01-10 15:04:10 +0000}, doi = {10.1145/358746.358767} }