B
[BL69] Julius R. Büchi and Lawrence H. Landweber. Solving Sequential Conditions by Finite-State Strategies. Transactions of the American Mathematical Society 138:295-311. American Mathematical Society, April 1969. 
@article{TAMS138-BL,
  author =              {B{\"u}chi, Julius R. and Landweber, Lawrence H.},
  title =               {Solving Sequential Conditions by Finite-State
                         Strategies},
  publisher =           {American Mathematical Society},
  journal =             {Transactions of the American Mathematical Society},
  volume =              {138},
  pages =               {295-311},
  year =                {1969},
  month =               apr,
}
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