Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page Graph theory:

"

Another problem in subdivision containment is the Kelmans–Seymour conjecture: * Every 5-vertex-connected graph that is not planar contains a subdivision of the 5-vertex complete graph K5. Another class of problems has to do with the extent to which various species and generalizations of graphs are determined by their point-deleted subgraphs. For example: