@article{10_37236_1783,
     author = {Johann Linhart and Ronald Ortner},
     title = {On the combinatorial structure of arrangements of oriented pseudocircles},
     journal = {The electronic journal of combinatorics},
     year = {2004},
     volume = {11},
     number = {1},
     doi = {10.37236/1783},
     zbl = {1053.52030},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1783/}
}