@article{10_37236_4458,
     author = {Edita Rollov\'a and Michael Schubert and Eckhard Steffen},
     title = {Flows in signed graphs with two negative edges},
     journal = {The electronic journal of combinatorics},
     year = {2018},
     volume = {25},
     number = {2},
     doi = {10.37236/4458},
     zbl = {1388.05079},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/4458/}
}