@article{JGAA_2021_25_1_a16,
     author = {Michael Kaufmann and J\'anos Pach and G\'eza T\'oth and Torsten Ueckerdt},
     title = {The number of crossings in multigraphs with no empty lens},
     journal = {Journal of Graph Algorithms and Applications},
     pages = {383--396},
     publisher = {mathdoc},
     volume = {25},
     number = {1},
     year = {2021},
     doi = {10.7155/jgaa.00563},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.7155/jgaa.00563/}
}