@techreport{SagnolBlancoSauvage2017, author = {Guillaume Sagnol and Marco Blanco and Thibaut Sauvage}, title = {The Cone of Flow Matrices: Approximation Hierarchies and Applications}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {17-32}, language = {eng}, year = {2017} }