@techreport{riedler18,
 author = {Markus Leitner and Ivana Ljubić and Martin Riedler and Mario Ruthmair},
 institution = {Algorithms and Complexity Group, TU Wien},
 keywords = {dndpr, mip},
 number = {AC-TR-18-001},
 title = {Exact approaches for the directed network design problem with relays},
 url = {http://www.ac.tuwien.ac.at/files/tr/ac-tr-18-001.pdf},
 year = {2018}
}