Daniel Bienstock. Some Provably Hard Crossing Number Problems. In Symposium on Computational Geometry. pages 253-260, 1990. [doi]
@inproceedings{Bienstock90-0, title = {Some Provably Hard Crossing Number Problems}, author = {Daniel Bienstock}, year = {1990}, doi = {10.1145/98524.98581}, url = {http://doi.acm.org/10.1145/98524.98581}, researchr = {https://researchr.org/publication/Bienstock90-0}, cites = {0}, citedby = {0}, pages = {253-260}, booktitle = {Symposium on Computational Geometry}, }