Frank Ruskey, Mark Weston. Spherical Venn Diagrams with Involutory Isometries. Electr. J. Comb., 18(1), 2011. [doi]
@article{RuskeyW11, title = {Spherical Venn Diagrams with Involutory Isometries}, author = {Frank Ruskey and Mark Weston}, year = {2011}, url = {http://www.combinatorics.org/Volume_18/Abstracts/v18i1p191.html}, researchr = {https://researchr.org/publication/RuskeyW11}, cites = {0}, citedby = {0}, journal = {Electr. J. Comb.}, volume = {18}, number = {1}, }