Micha A. Perles, Rom Pinchasi. Forbidden k-Sets in the Plane. SIAM J. Discrete Math., 21(2):385-395, 2007. [doi]
@article{PerlesP07, title = {Forbidden k-Sets in the Plane}, author = {Micha A. Perles and Rom Pinchasi}, year = {2007}, doi = {10.1137/050640229}, url = {http://dx.doi.org/10.1137/050640229}, researchr = {https://researchr.org/publication/PerlesP07}, cites = {0}, citedby = {0}, journal = {SIAM J. Discrete Math.}, volume = {21}, number = {2}, pages = {385-395}, }