Czabarka, Éva, Sýkora, O., Székely, L.A. and Vrťo, I. 2004. Outerplanar Crossing Numbers, the Circular Arrangement Problem and Isoperimetric Functions . The Electronic Journal of Combinatorics. 11, 1 (Nov. 2004), R81. DOI:https://doi.org/10.37236/1834.