@article{JGAA_2014_18_2_a4,
     author = {Fabrizio Frati and Michael Kaufmann and J\'anos Pach and Csaba T\'oth and David Wood},
     title = {On the {Upward} {Planarity} of {Mixed} {Plane} {Graphs}},
     journal = {Journal of Graph Algorithms and Applications},
     pages = {253--279},
     publisher = {mathdoc},
     volume = {18},
     number = {2},
     year = {2014},
     doi = {10.7155/jgaa.00322},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.7155/jgaa.00322/}
}