Last modified: 2007-01-26 16:45:46 UTC
On Englsih Wikipedia, several articles that should be listed in Category:Graph products are not. They carry the category tag, and link to the category page, but the category page does not include them. The articles are Cartesian product of graphs Lexicographic product of graphs Vizing's conjecture
I did a quick null edit on each page to force a link update, and it all shows up as it should now.