Matthias Kriesell. How to contract an essentially 6-connected graph to a 5-connected graph. Discrete Mathematics, 307(3-5):494-510, 2007. [doi]
@article{Kriesell07, title = {How to contract an essentially 6-connected graph to a 5-connected graph}, author = {Matthias Kriesell}, year = {2007}, doi = {10.1016/j.disc.2005.09.040}, url = {http://dx.doi.org/10.1016/j.disc.2005.09.040}, tags = {contracts, graph-rewriting, rewriting}, researchr = {https://researchr.org/publication/Kriesell07}, cites = {0}, citedby = {0}, journal = {Discrete Mathematics}, volume = {307}, number = {3-5}, pages = {494-510}, }