@article{GugatSchultzSchuster2019, author = {Martin Gugat and R{\"u}diger Schultz and Michael Schuster}, title = {Convexity and Starshapedness of Feasible Sets in Stationary Flow Networks}, journal = {Networks and Heterogeneous Media}, pages = {171 -- 195}, doi = {10.3934/nhm.2020008}, year = {2019}, }