(Author here) Matt, I'm very sorry. It was a genuine mistake. I always try hard to attribute sources (as you can see from the references in the doc, and on t

(Author here) Matt, I'm very sorry. It was a genuine mistake. I always try hard to attribute sources (as you can see from the references in the doc, and on the couple of hundred other articles on my blog). It was nothing personal, it was an oversight :) I've corrected this now on the site. Sorry again. Thanks for bringing this to my attention. Regards /\/ick