@article{JGAA_2008_12_1_a3,
     author = {David Eppstein},
     title = {Upright-Quad {Drawing} of {st-Planar} {Learning} {Spaces}},
     journal = {Journal of Graph Algorithms and Applications},
     pages = {51--72},
     publisher = {mathdoc},
     volume = {12},
     number = {1},
     year = {2008},
     doi = {10.7155/jgaa.00159},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.7155/jgaa.00159/}
}