@article{JGAA_2011_15_3_a3,
     author = {Tamara Mchedlidze and Antonios Symvonis},
     title = {Crossing-Optimal {Acyclic} {HP-Completion} for {Outerplanar} {st-Digraphs}},
     journal = {Journal of Graph Algorithms and Applications},
     pages = {373--415},
     publisher = {mathdoc},
     volume = {15},
     number = {3},
     year = {2011},
     doi = {10.7155/jgaa.00231},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.7155/jgaa.00231/}
}