I was looking up how to program for a D-Wave machine and I came across this image which says it's the "optimal hardware graph" for a D-Wave machine:
Unfortunately the image seems to have come from this website: http://people.cs.vt.edu/~vchoi/MinorEmbed.pdf (I got a preview somewhere else and they provided a link to this website), and when I click on that link it says "Forbidden You don't have permission to access /~vchoi on this server." The same happens if I remove the PDF from the URL and only look at the faculty member's webpage. The webpage does work if I remove the faculty member's name though, but then it's just the CS department website.
So where can I find the original work where this comes from? I searched for alternative sources on Google, but it seems that "triad" means very many different things!