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[BBB+07] Patricia Bouyer, Thomas Brihaye, Véronique Bruyère, and Jean-François Raskin. On the Optimal Reachability Problem of Weighted Timed Automata. Formal Methods in System Design 31(2):135-175. Springer-Verlag, October 2007. 
@article{fmsd31(2)-BBBR,
  author =              {Bouyer, Patricia and Brihaye, {\relax Th}omas and
                         Bruy{\`e}re, V{\'e}ronique and Raskin, Jean-Fran{\c
                         c}ois},
  title =               {On the Optimal Reachability Problem of Weighted
                         Timed Automata},
  publisher =           {Springer-Verlag},
  journal =             {Formal Methods in System Design},
  volume =              {31},
  number =              {2},
  pages =               {135-175},
  year =                {2007},
  month =               oct,
  doi =                 {10.1007/s10703-007-0035-4},
}
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