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   @Article{ZachariasenRohe03,
     author =       {M. Zachariasen and A. Rohe},
     title =        {{Rectilinear Group Steiner Trees and Applications in VLSI Design}}, 
     journal =      {Mathematical Programming},
     volume =       {94},
     pages =        {407--433}, 
     year =         {2003},
     doi =          {10.1007/s10107-002-0326-x},
   }