@article{JGAA_2023_27_2_a2,
     author = {Jonathan Klawitter and Johannes Zink},
     title = {Upward {Planar} {Drawings} with {Three} and {More} {Slopes}},
     journal = {Journal of Graph Algorithms and Applications},
     pages = {49--70},
     publisher = {mathdoc},
     volume = {27},
     number = {2},
     year = {2023},
     doi = {10.7155/jgaa.00617},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.7155/jgaa.00617/}
}