M
[Min61] Marvin L. Minsky. Recursive Unsolvability of Post's Problem of "Tag" and other Topics in Theory of Turing Machines. Annals of Mathematics 74(3):437-455. Princeton University Press, November 1961. 
@article{am74(3)-Min,
  author =              {Minsky, Marvin L.},
  title =               {Recursive Unsolvability of {P}ost's Problem of
                         {"}Tag{"} and other Topics in Theory of {T}uring
                         Machines},
  publisher =           {Princeton University Press},
  journal =             {Annals of Mathematics},
  volume =              {74},
  number =              {3},
  pages =               {437-455},
  year =                {1961},
  month =               nov,
}
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