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   @Article{WinterZachariasen05,
     author =        {P. Winter and M. Zachariasen}, 
     title =         {{Two-Connected Steiner Networks: Structural Properties}},
     journal =       {Operations Research Letters},
     volume =        {33},
     pages =         {395--402}, 
     year =          {2005},
     doi =           {10.1016/j.orl.2004.07.010},
   }